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| author | Michael Niedermayer <michael@niedermayer.cc> | 2016-01-20 09:43:54 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2016-01-20 21:21:31 +0100 |
| commit | 984d58a3440d513f66344b5332f6b589c0a6bbc6 (patch) | |
| tree | 832394b7034208b5fe56da0ec999e10a075744bb | |
| parent | d96f0fbe59ae82ab4d18484a98b20377ffe11811 (diff) | |
| download | ffmpeg-984d58a3440d513f66344b5332f6b589c0a6bbc6.tar.gz | |
avformat/avio: Limit url option parsing to the documented cases
This feature is not know much or used much AFAIK, and it might be helpfull in
exploits.
No specific case is known where it can be used in an exploit though
subsequent commits depend on this commit though
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/avio.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/libavformat/avio.c b/libavformat/avio.c index 21713d9d5e..05d055713f 100644 --- a/libavformat/avio.c +++ b/libavformat/avio.c @@ -156,9 +156,16 @@ static int url_alloc_for_protocol(URLContext **puc, struct URLProtocol *up, char sep= *++p; char *key, *val; p++; + + if (strcmp(up->name, "subfile")) + ret = AVERROR(EINVAL); + while(ret >= 0 && (key= strchr(p, sep)) && p<key && (val = strchr(key+1, sep))){ *val= *key= 0; - ret= av_opt_set(uc->priv_data, p, key+1, 0); + if (strcmp(p, "start") && strcmp(p, "end")) { + ret = AVERROR_OPTION_NOT_FOUND; + } else + ret= av_opt_set(uc->priv_data, p, key+1, 0); if (ret == AVERROR_OPTION_NOT_FOUND) av_log(uc, AV_LOG_ERROR, "Key '%s' not found.\n", p); *val= *key= sep; @@ -243,7 +250,7 @@ static struct URLProtocol *url_find_protocol(const char *filename) size_t proto_len = strspn(filename, URL_SCHEME_CHARS); if (filename[proto_len] != ':' && - (filename[proto_len] != ',' || !strchr(filename + proto_len + 1, ':')) || + (strncmp(filename, "subfile,", 8) || !strchr(filename + proto_len + 1, ':')) || is_dos_path(filename)) strcpy(proto_str, "file"); else |