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https://github.com/moparisthebest/curl
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smb: fix memory leak on early failure
... by making sure connection related data (->share) is stored in the connection and not in the easy handle. Detected by OSS-fuzz Bug: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=9369 Fixes #2769 Closes #2810
This commit is contained in:
Daniel Stenberg
parent
fe60cbfbbf
commit
09e401e01b
69
lib/smb.c
69
lib/smb.c
@ -59,6 +59,7 @@
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static CURLcode smb_setup_connection(struct connectdata *conn);
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static CURLcode smb_connect(struct connectdata *conn, bool *done);
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static CURLcode smb_connection_state(struct connectdata *conn, bool *done);
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static CURLcode smb_do(struct connectdata *conn, bool *done);
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static CURLcode smb_request_state(struct connectdata *conn, bool *done);
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static CURLcode smb_done(struct connectdata *conn, CURLcode status,
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bool premature);
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@ -73,7 +74,7 @@ static CURLcode smb_parse_url_path(struct connectdata *conn);
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const struct Curl_handler Curl_handler_smb = {
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"SMB", /* scheme */
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smb_setup_connection, /* setup_connection */
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ZERO_NULL, /* do_it */
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smb_do, /* do_it */
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smb_done, /* done */
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ZERO_NULL, /* do_more */
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smb_connect, /* connect_it */
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@ -98,7 +99,7 @@ const struct Curl_handler Curl_handler_smb = {
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const struct Curl_handler Curl_handler_smbs = {
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"SMBS", /* scheme */
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smb_setup_connection, /* setup_connection */
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ZERO_NULL, /* do_it */
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smb_do, /* do_it */
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smb_done, /* done */
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ZERO_NULL, /* do_more */
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smb_connect, /* connect_it */
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@ -173,7 +174,6 @@ enum smb_req_state {
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/* SMB request data */
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struct smb_request {
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enum smb_req_state state;
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char *share;
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char *path;
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unsigned short tid; /* Even if we connect to the same tree as another */
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unsigned short fid; /* request, the tid will be different */
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@ -182,7 +182,7 @@ struct smb_request {
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static void conn_state(struct connectdata *conn, enum smb_conn_state newstate)
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{
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struct smb_conn *smb = &conn->proto.smbc;
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struct smb_conn *smbc = &conn->proto.smbc;
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#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
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/* For debug purposes */
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static const char * const names[] = {
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@ -194,12 +194,12 @@ static void conn_state(struct connectdata *conn, enum smb_conn_state newstate)
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/* LAST */
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};
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if(smb->state != newstate)
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if(smbc->state != newstate)
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infof(conn->data, "SMB conn %p state change from %s to %s\n",
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(void *)smb, names[smb->state], names[newstate]);
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(void *)smbc, names[smbc->state], names[newstate]);
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#endif
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smb->state = newstate;
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smbc->state = newstate;
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}
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static void request_state(struct connectdata *conn,
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@ -228,6 +228,8 @@ static void request_state(struct connectdata *conn,
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req->state = newstate;
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}
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/* this should setup things in the connection, not in the easy
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handle */
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static CURLcode smb_setup_connection(struct connectdata *conn)
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{
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struct smb_request *req;
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@ -253,7 +255,6 @@ static CURLcode smb_connect(struct connectdata *conn, bool *done)
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return CURLE_LOGIN_DENIED;
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/* Initialize the connection state */
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memset(smbc, 0, sizeof(*smbc));
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smbc->state = SMB_CONNECTING;
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smbc->recv_buf = malloc(MAX_MESSAGE_SIZE);
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if(!smbc->recv_buf)
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@ -475,11 +476,11 @@ static CURLcode smb_send_setup(struct connectdata *conn)
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static CURLcode smb_send_tree_connect(struct connectdata *conn)
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{
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struct smb_request *req = conn->data->req.protop;
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struct smb_tree_connect msg;
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struct smb_conn *smbc = &conn->proto.smbc;
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char *p = msg.bytes;
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size_t byte_count = strlen(conn->host.name) + strlen(req->share);
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size_t byte_count = strlen(conn->host.name) + strlen(smbc->share);
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byte_count += strlen(SERVICENAME) + 5; /* 2 nulls and 3 backslashes */
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if(byte_count > sizeof(msg.bytes))
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return CURLE_FILESIZE_EXCEEDED;
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@ -491,7 +492,7 @@ static CURLcode smb_send_tree_connect(struct connectdata *conn)
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MSGCAT("\\\\");
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MSGCAT(conn->host.name);
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MSGCAT("\\");
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MSGCATNULL(req->share);
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MSGCATNULL(smbc->share);
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MSGCATNULL(SERVICENAME); /* Match any type of service */
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byte_count = p - msg.bytes;
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msg.byte_count = smb_swap16((unsigned short)byte_count);
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@ -910,31 +911,18 @@ static CURLcode smb_request_state(struct connectdata *conn, bool *done)
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static CURLcode smb_done(struct connectdata *conn, CURLcode status,
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bool premature)
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{
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struct smb_request *req = conn->data->req.protop;
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(void) premature;
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Curl_safefree(req->share);
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Curl_safefree(conn->data->req.protop);
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return status;
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}
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static CURLcode smb_disconnect(struct connectdata *conn, bool dead)
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{
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struct smb_conn *smbc = &conn->proto.smbc;
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struct smb_request *req = conn->data->req.protop;
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(void) dead;
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Curl_safefree(smbc->share);
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Curl_safefree(smbc->domain);
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Curl_safefree(smbc->recv_buf);
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/* smb_done is not always called, so cleanup the request */
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if(req) {
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Curl_safefree(req->share);
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}
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return CURLE_OK;
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}
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@ -948,11 +936,27 @@ static int smb_getsock(struct connectdata *conn, curl_socket_t *socks,
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return GETSOCK_READSOCK(0) | GETSOCK_WRITESOCK(0);
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}
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static CURLcode smb_do(struct connectdata *conn, bool *done)
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{
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struct smb_conn *smbc = &conn->proto.smbc;
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struct smb_request *req = conn->data->req.protop;
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if(smbc->share) {
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req->path = strchr(smbc->share, '\0');
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if(req->path) {
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req->path++;
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*done = TRUE;
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return CURLE_OK;
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}
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}
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return CURLE_URL_MALFORMAT;
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}
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static CURLcode smb_parse_url_path(struct connectdata *conn)
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{
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CURLcode result = CURLE_OK;
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struct Curl_easy *data = conn->data;
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struct smb_request *req = data->req.protop;
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struct smb_conn *smbc = &conn->proto.smbc;
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char *path;
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char *slash;
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@ -962,30 +966,29 @@ static CURLcode smb_parse_url_path(struct connectdata *conn)
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return result;
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/* Parse the path for the share */
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req->share = strdup((*path == '/' || *path == '\\') ? path + 1 : path);
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smbc->share = strdup((*path == '/' || *path == '\\') ? path + 1 : path);
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free(path);
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if(!req->share)
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if(!smbc->share)
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return CURLE_OUT_OF_MEMORY;
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slash = strchr(req->share, '/');
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slash = strchr(smbc->share, '/');
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if(!slash)
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slash = strchr(req->share, '\\');
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slash = strchr(smbc->share, '\\');
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/* The share must be present */
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if(!slash) {
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Curl_safefree(req->share);
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Curl_safefree(smbc->share);
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return CURLE_URL_MALFORMAT;
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}
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/* Parse the path for the file path converting any forward slashes into
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backslashes */
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*slash++ = 0;
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req->path = slash;
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for(; *slash; slash++) {
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if(*slash == '/')
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*slash = '\\';
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}
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return CURLE_OK;
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}
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