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authorEven Rouault <even.rouault@spatialys.com>2019-04-07 14:07:35 +0200
committerDaniel Stenberg <daniel@haxx.se>2019-04-07 22:55:38 +0200
commit64cbae31078b2b64818a1d793516fbe73a7e4c45 (patch)
tree55a6fad03da0d5b1ccebe168146679933415246f /tests/libtest/Makefile.am
parent2f44e94efb3df8e50bb2ddbc4ec6b569a6424517 (diff)
multi_runsingle(): fix use-after-free
Fixes #3745 Closes #3746 The following snippet ``` int main() { CURL* hCurlHandle = curl_easy_init(); curl_easy_setopt(hCurlHandle, CURLOPT_URL, "http://example.com"); curl_easy_setopt(hCurlHandle, CURLOPT_PROXY, "1"); curl_easy_perform(hCurlHandle); curl_easy_cleanup(hCurlHandle); return 0; } ``` triggers the following Valgrind warning ``` ==4125== Invalid read of size 8 ==4125== at 0x4E7D1EE: Curl_llist_remove (llist.c:97) ==4125== by 0x4E7EF5C: detach_connnection (multi.c:798) ==4125== by 0x4E80545: multi_runsingle (multi.c:1451) ==4125== by 0x4E8197C: curl_multi_perform (multi.c:2072) ==4125== by 0x4E766A0: easy_transfer (easy.c:625) ==4125== by 0x4E76915: easy_perform (easy.c:719) ==4125== by 0x4E7697C: curl_easy_perform (easy.c:738) ==4125== by 0x4008BE: main (in /home/even/curl/test) ==4125== Address 0x9b3d1d0 is 1,120 bytes inside a block of size 1,600 free'd ==4125== at 0x4C2ECF0: free (vg_replace_malloc.c:530) ==4125== by 0x4E62C36: conn_free (url.c:756) ==4125== by 0x4E62D34: Curl_disconnect (url.c:818) ==4125== by 0x4E48DF9: Curl_once_resolved (hostip.c:1097) ==4125== by 0x4E8052D: multi_runsingle (multi.c:1446) ==4125== by 0x4E8197C: curl_multi_perform (multi.c:2072) ==4125== by 0x4E766A0: easy_transfer (easy.c:625) ==4125== by 0x4E76915: easy_perform (easy.c:719) ==4125== by 0x4E7697C: curl_easy_perform (easy.c:738) ==4125== by 0x4008BE: main (in /home/even/curl/test) ==4125== Block was alloc'd at ==4125== at 0x4C2F988: calloc (vg_replace_malloc.c:711) ==4125== by 0x4E6438E: allocate_conn (url.c:1654) ==4125== by 0x4E685B4: create_conn (url.c:3496) ==4125== by 0x4E6968F: Curl_connect (url.c:4023) ==4125== by 0x4E802E7: multi_runsingle (multi.c:1368) ==4125== by 0x4E8197C: curl_multi_perform (multi.c:2072) ==4125== by 0x4E766A0: easy_transfer (easy.c:625) ==4125== by 0x4E76915: easy_perform (easy.c:719) ==4125== by 0x4E7697C: curl_easy_perform (easy.c:738) ==4125== by 0x4008BE: main (in /home/even/curl/test) ``` This has been bisected to commit 2f44e94 Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=14109 Credit to OSS Fuzz
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