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avformat/hls: Check TIME-OFFSET value

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Fixes: UB with out of range values
Fixes: poc_overflow.m3u8

Found-by: jiale yao
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 59094859a8)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2026-05-20 01:24:54 +02:00
parent 61ffafe95b
commit 69ca310fb7
1 changed files with 8 additions and 3 deletions
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libavformat/hls.c
+8 -3
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@@ -963,9 +963,14 @@ static int parse_playlist(HLSContext *c, const char *url,
goto fail;
}
if (av_strstart(ptr, "TIME-OFFSET=", &time_offset_value)) {
float offset = strtof(time_offset_value, NULL);
pls->start_time_offset = offset * AV_TIME_BASE;
pls->time_offset_flag = 1;
double offset = strtod(time_offset_value, NULL) * AV_TIME_BASE;
if (offset >= -0x1p63 && offset < 0x1p63) {
pls->start_time_offset = offset;
pls->time_offset_flag = 1;
} else {
av_log(c->ctx, AV_LOG_WARNING, "TIME-OFFSET value is"
"invalid, it will be ignored");
}
} else {
av_log(c->ctx, AV_LOG_WARNING, "#EXT-X-START value is"
"invalid, it will be ignored");