avcodec/smc: fix off by 1 error

Fixes out of array access Fixes: asan_heap-oob_1685bf0_5_asan_heap-oob_1f35116_430_smc.mov Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer <michaelni@gmx.at> (cherry picked from commit c727401aa9d62335e89d118a5b4e202edf39d905) Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2014-10-03 22:50:45 +02:00 · 2014-10-03 22:50:45 +02:00 · 5b2097626d
commit 5b2097626d
parent faf293a83a
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/smc.c
+++ b/libavcodec/smc.c
@ -68,7 +68,7 @@ typedef struct SmcContext {
        row_ptr += stride * 4; \
    } \
    total_blocks--; \
-    if (total_blocks < 0) \
+    if (total_blocks < 0 + !!n_blocks) \
    { \
        av_log(s->avctx, AV_LOG_INFO, "warning: block counter just went negative (this should not happen)\n"); \
        return; \