cookie: avoid harmless use after free #4454
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This fix removes a use after free which can be triggered by
the internal cookie fuzzer, but otherwise is probably
impossible to trigger from an ordinary application.
The following program reproduces it:
curl_global_init(CURL_GLOBAL_DEFAULT);
CURL* handle=curl_easy_init();
CookieInfo* info=Curl_cookie_init(handle,NULL,NULL,false);
curl_easy_setopt(handle, CURLOPT_COOKIEJAR, "/dev/null");
Curl_flush_cookies(handle, true);
Curl_cookie_cleanup(info);
curl_easy_cleanup(handle);
curl_global_cleanup();
This was found through fuzzing.
bagder
approved these changes
Oct 3, 2019
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Picky checksrc: |
when will I ever learn
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Thanks! |
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This fix removes a use after free which can be triggered by
the internal cookie fuzzer, but otherwise is probably
impossible to trigger from an ordinary application (Thanks @bagder for checking).
The following program reproduces it:
This was found through fuzzing.