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avcodec/htmlsubtitles: Be a bit more picky on syntax

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This reduces the number of strstr() calls per byte
This diasalows empty tags like '< >' as well as '<' in tags like '<ab<cd<<ef>'

Fixes timeout
Fixes: 1817/clusterfuzz-testcase-minimized-5104230530547712

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-07-02 00:09:42 +02:00
parent 2886142e0c
commit c61715e2c5
1 changed files with 2 additions and 2 deletions
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libavcodec/htmlsubtitles.c
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@ -110,13 +110,13 @@ int ff_htmlmarkup_to_ass(void *log_ctx, AVBPrint *dst, const char *in)
case '<':
tag_close = in[1] == '/';
len = 0;
if (sscanf(in+tag_close+1, "%127[^>]>%n", buffer, &len) >= 1 && len > 0) {
if (sscanf(in+tag_close+1, "%127[^<>]>%n", buffer, &len) >= 1 && len > 0) {
const char *tagname = buffer;
while (*tagname == ' ')
tagname++;
if ((param = strchr(tagname, ' ')))
*param++ = 0;
if ((!tag_close && sptr < FF_ARRAY_ELEMS(stack)) ||
if ((!tag_close && sptr < FF_ARRAY_ELEMS(stack) && *tagname) ||
( tag_close && sptr > 0 && !av_strcasecmp(stack[sptr-1].tag, tagname))) {
int i, j, unknown = 0;
in += len + tag_close;