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avformat/subfile: clip seek offset

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Fixes: signed integer overflow: 9223372036854737920 + 1649410 cannot be
represented in type 'int64_t'

Fixes OSS-Fuzz: 410100610

Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
This commit is contained in:
Kacper Michajłow 2025-07-11 21:44:33 +02:00
parent d12863a693
commit e29016a9de
1 changed files with 3 additions and 3 deletions
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6
libavformat/subfile.c
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@ -128,13 +128,13 @@ static int64_t subfile_seek(URLContext *h, int64_t pos, int whence)
case AVSEEK_SIZE:
return end - c->start;
case SEEK_SET:
new_pos = c->start + pos;
new_pos = c->start + av_clip(pos, 0, end - c->start);
break;
case SEEK_CUR:
new_pos = c->pos + pos;
new_pos = c->pos + av_clip(pos, -(c->pos - c->start), end - c->pos);
break;
case SEEK_END:
new_pos = end + pos;
new_pos = end + av_clip(pos, -(end - c->start), 0);
break;
default:
av_assert0(0);