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avcodec/g2meet: Check monochrome cursor width

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Fixes out of array write

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-06-14 21:13:47 +02:00
parent 69e4d8e6a4
commit 3c4c5ca1c1
1 changed files with 5 additions and 0 deletions
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5
libavcodec/g2meet.c
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@ -514,6 +514,11 @@ static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
return AVERROR_PATCHWELCOME; return AVERROR_PATCHWELCOME;
} }
if (cursor_fmt == 1 && cursor_w % 32) {
avpriv_report_missing_feature(avctx, "odd monochrome cursor width %d", cursor_w);
return AVERROR_PATCHWELCOME;
}
tmp = av_realloc(c->cursor, cursor_stride * cursor_h); tmp = av_realloc(c->cursor, cursor_stride * cursor_h);
if (!tmp) { if (!tmp) {
av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n"); av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");