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lib1591: free memory properly on OOM, in the trailers callback

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Detected by torture tests.

Closes #4720
This commit is contained in:
Daniel Stenberg 2019-12-15 12:33:24 +01:00
parent 571f2c81d1
commit 38797e8811
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GPG Key ID: 5CC908FDB71E12C2
1 changed files with 17 additions and 4 deletions
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21
tests/libtest/lib1591.c
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@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___ * | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____| * \___|\___/|_| \_\_____|
* *
* Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al. * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
* *
* This software is licensed as described in the file COPYING, which * This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms * you should have received as part of this distribution. The terms
@ -50,12 +50,25 @@ static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
return amount; return amount;
} }
/*
* carefully not leak memory on OOM
*/
static int trailers_callback(struct curl_slist **list, void *userdata) static int trailers_callback(struct curl_slist **list, void *userdata)
{ {
struct curl_slist *nlist = NULL;
struct curl_slist *nlist2 = NULL;
(void)userdata; (void)userdata;
*list = curl_slist_append(*list, "my-super-awesome-trailer: trail1"); nlist = curl_slist_append(*list, "my-super-awesome-trailer: trail1");
*list = curl_slist_append(*list, "my-other-awesome-trailer: trail2"); if(nlist)
return CURL_TRAILERFUNC_OK; nlist2 = curl_slist_append(nlist, "my-other-awesome-trailer: trail2");
if(nlist2) {
*list = nlist2;
return CURL_TRAILERFUNC_OK;
}
else {
curl_slist_free_all(nlist);
return CURL_TRAILERFUNC_ABORT;
}
} }
int test(char *URL) int test(char *URL)