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sanm: Use the correct height variable in the decoded_size checks

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Fixes integer overflow and out of array accesses

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-02-12 02:03:28 +01:00
parent 4ee88db840
commit 5260edee7e
1 changed files with 4 additions and 4 deletions
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8
libavcodec/sanm.c
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@ -420,8 +420,8 @@ static int old_codec37(SANMVideoContext *ctx, int top,
flags = bytestream2_get_byte(&ctx->gb);
bytestream2_skip(&ctx->gb, 3);
if (decoded_size > height * stride - left - top * stride) {
decoded_size = height * stride - left - top * stride;
if (decoded_size > ctx->height * stride - left - top * stride) {
decoded_size = ctx->height * stride - left - top * stride;
av_log(ctx->avctx, AV_LOG_WARNING, "decoded size is too large\n");
}
@ -658,8 +658,8 @@ static int old_codec47(SANMVideoContext *ctx, int top,
decoded_size = bytestream2_get_le32(&ctx->gb);
bytestream2_skip(&ctx->gb, 8);
if (decoded_size > height * stride - left - top * stride) {
decoded_size = height * stride - left - top * stride;
if (decoded_size > ctx->height * stride - left - top * stride) {
decoded_size = ctx->height * stride - left - top * stride;
av_log(ctx->avctx, AV_LOG_WARNING, "decoded size is too large\n");
}