mirror of https://github.com/moparisthebest/curl
altsvc: make the save function ignore NULL filenames
It might happen in OOM situations. Detected bv torture tests. Closes #4707
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@ -320,8 +320,8 @@ CURLcode Curl_altsvc_save(struct altsvcinfo *altsvc, const char *file)
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/* no cache activated */
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return CURLE_OK;
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if((altsvc->flags & CURLALTSVC_READONLYFILE) || !file[0])
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/* marked as read-only or zero length file name */
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if((altsvc->flags & CURLALTSVC_READONLYFILE) || !file || !file[0])
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/* marked as read-only, no file or zero length file name */
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return CURLE_OK;
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out = fopen(file, FOPEN_WRITETEXT);
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if(!out)
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