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rtsp: do not call fwrite() with NULL pointer FILE *

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If the default write callback is used and no destination has been set, a
NULL pointer would be passed to fwrite()'s 4th argument.

OSS-fuzz bug https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=3327
(not publicly open yet)

Detected by OSS-fuzz
Closes #1874
This commit is contained in:
Daniel Stenberg 2017-09-08 10:20:36 +02:00
parent f8548e84ad
commit a14f7152ce
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GPG Key ID: 5CC908FDB71E12C2
2 changed files with 9 additions and 0 deletions
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9
lib/rtsp.c
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@ -756,6 +756,15 @@ CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len)
}
writeit = data->set.fwrite_rtp?data->set.fwrite_rtp:data->set.fwrite_func;
if(!data->set.fwrite_rtp && !data->set.is_fwrite_set &&
!data->set.rtp_out) {
/* if no callback is set for either RTP or default, the default function
fwrite() is utilized and that can't handle a NULL input */
failf(data, "No destination to default data callback!");
return CURLE_WRITE_ERROR;
}
wrote = writeit(ptr, 1, len, data->set.rtp_out);
if(CURL_WRITEFUNC_PAUSE == wrote) {

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tests/fuzz/curl_fuzz_data/oss-fuzz-3327 Normal file
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