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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-06 01:42:53 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-08 17:02:02 +0200 |
| commit | f4ae3cce64bd46b1d539bdeac39753f83015f114 (patch) | |
| tree | 4340bf904fd6de7d818f91f0b62a93d4c1cb2a0f | |
| parent | aaeec1c654a2c139a7bc95e677a23d8ac57f1c5e (diff) | |
| download | ffmpeg-f4ae3cce64bd46b1d539bdeac39753f83015f114.tar.gz | |
avcodec/htmlsubtitles: Check for string truncation and return error
Fixes out of array access
Fixes: 1354/clusterfuzz-testcase-minimized-5520132195483648
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/htmlsubtitles.c | 12 | ||||
| -rw-r--r-- | libavcodec/htmlsubtitles.h | 2 |
2 files changed, 10 insertions, 4 deletions
diff --git a/libavcodec/htmlsubtitles.c b/libavcodec/htmlsubtitles.c index 8b57febd26..16295daa0c 100644 --- a/libavcodec/htmlsubtitles.c +++ b/libavcodec/htmlsubtitles.c @@ -46,11 +46,12 @@ typedef struct SrtStack { static void rstrip_spaces_buf(AVBPrint *buf) { - while (buf->len > 0 && buf->str[buf->len - 1] == ' ') - buf->str[--buf->len] = 0; + if (av_bprint_is_complete(buf)) + while (buf->len > 0 && buf->str[buf->len - 1] == ' ') + buf->str[--buf->len] = 0; } -void ff_htmlmarkup_to_ass(void *log_ctx, AVBPrint *dst, const char *in) +int ff_htmlmarkup_to_ass(void *log_ctx, AVBPrint *dst, const char *in) { char *param, buffer[128], tmp[128]; int len, tag_close, sptr = 1, line_start = 1, an = 0, end = 0; @@ -171,8 +172,13 @@ void ff_htmlmarkup_to_ass(void *log_ctx, AVBPrint *dst, const char *in) line_start = 0; } + if (!av_bprint_is_complete(dst)) + return AVERROR(ENOMEM); + while (dst->len >= 2 && !strncmp(&dst->str[dst->len - 2], "\\N", 2)) dst->len -= 2; dst->str[dst->len] = 0; rstrip_spaces_buf(dst); + + return 0; } diff --git a/libavcodec/htmlsubtitles.h b/libavcodec/htmlsubtitles.h index e10cdda241..f3a8ef5d8b 100644 --- a/libavcodec/htmlsubtitles.h +++ b/libavcodec/htmlsubtitles.h @@ -23,6 +23,6 @@ #include "libavutil/bprint.h" -void ff_htmlmarkup_to_ass(void *log_ctx, AVBPrint *dst, const char *in); +int ff_htmlmarkup_to_ass(void *log_ctx, AVBPrint *dst, const char *in); #endif /* AVCODEC_HTMLSUBTITLES_H */ |