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easy: resize receive buffer on easy handle reset
- In curl_easy_reset attempt to resize the receive buffer to its default size. If realloc fails then continue using the previous size. Prior to this change curl_easy_reset did not properly handle resetting the receive buffer (data->state.buffer). It reset the variable holding its size (data->set.buffer_size) to the default size (READBUFFER_SIZE) but then did not actually resize the buffer. If a user resized the buffer by using CURLOPT_BUFFERSIZE to set the size smaller than the default, later called curl_easy_reset and attempted to reuse the handle then a heap overflow would very likely occur during that handle's next transfer. Reported-by: Felix Hädicke Fixes https://github.com/curl/curl/issues/4143 Closes https://github.com/curl/curl/pull/4145
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lib/easy.c
14
lib/easy.c
@ -942,6 +942,8 @@ struct Curl_easy *curl_easy_duphandle(struct Curl_easy *data)
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*/
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void curl_easy_reset(struct Curl_easy *data)
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{
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long old_buffer_size = data->set.buffer_size;
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Curl_free_request_state(data);
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/* zero out UserDefined data: */
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@ -965,6 +967,18 @@ void curl_easy_reset(struct Curl_easy *data)
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#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_CRYPTO_AUTH)
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Curl_http_auth_cleanup_digest(data);
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#endif
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/* resize receive buffer */
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if(old_buffer_size != data->set.buffer_size) {
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char *newbuff = realloc(data->state.buffer, data->set.buffer_size + 1);
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if(!newbuff) {
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DEBUGF(fprintf(stderr, "Error: realloc of buffer failed\n"));
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/* nothing we can do here except use the old size */
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data->set.buffer_size = old_buffer_size;
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}
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else
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data->state.buffer = newbuff;
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}
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}
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/*
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