Module: libav Branch: release/9 Commit: 7b337b122959b9bf634c31b549892df974f35b40
Author: Anton Khirnov <[email protected]> Committer: Reinhard Tartler <[email protected]> Date: Fri Nov 15 19:06:23 2013 +0100 truemotion1: make sure index does not go out of bounds Fixes invalid reads. Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind CC:[email protected] (cherry picked from commit c918e08b9cc9ce8d06159c51da55ec5ab018039a) Signed-off-by: Reinhard Tartler <[email protected]> --- libavcodec/truemotion1.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/libavcodec/truemotion1.c b/libavcodec/truemotion1.c index c49f9fe..63cd05b 100644 --- a/libavcodec/truemotion1.c +++ b/libavcodec/truemotion1.c @@ -512,6 +512,15 @@ hres,vres,i,i%vres (0 < i < 4) index = s->index_stream[index_stream_index++] * 4; \ } +#define INC_INDEX \ +do { \ + if (index >= 1023) { \ + av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n"); \ + return; \ + } \ + index++; \ +} while (0) + #define APPLY_C_PREDICTOR() \ predictor_pair = s->c_predictor_table[index]; \ horiz_pred += (predictor_pair >> 1); \ @@ -524,10 +533,10 @@ hres,vres,i,i%vres (0 < i < 4) if (predictor_pair & 1) \ GET_NEXT_INDEX() \ else \ - index++; \ + INC_INDEX; \ } \ } else \ - index++; + INC_INDEX; #define APPLY_C_PREDICTOR_24() \ predictor_pair = s->c_predictor_table[index]; \ @@ -541,10 +550,10 @@ hres,vres,i,i%vres (0 < i < 4) if (predictor_pair & 1) \ GET_NEXT_INDEX() \ else \ - index++; \ + INC_INDEX; \ } \ } else \ - index++; + INC_INDEX; #define APPLY_Y_PREDICTOR() \ @@ -559,10 +568,10 @@ hres,vres,i,i%vres (0 < i < 4) if (predictor_pair & 1) \ GET_NEXT_INDEX() \ else \ - index++; \ + INC_INDEX; \ } \ } else \ - index++; + INC_INDEX; #define APPLY_Y_PREDICTOR_24() \ predictor_pair = s->y_predictor_table[index]; \ @@ -576,10 +585,10 @@ hres,vres,i,i%vres (0 < i < 4) if (predictor_pair & 1) \ GET_NEXT_INDEX() \ else \ - index++; \ + INC_INDEX; \ } \ } else \ - index++; + INC_INDEX; #define OUTPUT_PIXEL_PAIR() \ *current_pixel_pair = *vert_pred + horiz_pred; \ _______________________________________________ libav-commits mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-commits
