[FFmpeg-cvslog] avcodec/indeo3: use signed variables to avoid underflow

[Michael Niedermayer]

ffmpeg | branch: release/2.1 | Michael Niedermayer <michaelni at gmx.at> | Wed Dec 17 03:14:21 2014 +0100| [35819400e7821a8acbd11cb5c537cd84601e077b] | committer: Michael Niedermayer

avcodec/indeo3: use signed variables to avoid underflow

Fixes out of array read
Fixes: signal_sigsegv_1b0a4da_1865_cov_2167818389_computer_anger.avi
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 3305acdc92fa37869f160a11a87741c8a0de0454)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=35819400e7821a8acbd11cb5c537cd84601e077b
---

 libavcodec/indeo3.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/libavcodec/indeo3.c b/libavcodec/indeo3.c
index b882763..ea8e4d8 100644
--- a/libavcodec/indeo3.c
+++ b/libavcodec/indeo3.c
@@ -94,7 +94,7 @@ typedef struct Indeo3DecodeContext {
 
     int16_t         width, height;
     uint32_t        frame_num;      ///< current frame number (zero-based)
-    uint32_t        data_size;      ///< size of the frame data in bytes
+    int             data_size;      ///< size of the frame data in bytes
     uint16_t        frame_flags;    ///< frame properties
     uint8_t         cb_offset;      ///< needed for selecting VQ tables
     uint8_t         buf_sel;        ///< active frame buffer: 0 - primary, 1 -secondary
@@ -899,7 +899,8 @@ static int decode_frame_headers(Indeo3DecodeContext *ctx, AVCodecContext *avctx,
     GetByteContext gb;
     const uint8_t   *bs_hdr;
     uint32_t        frame_num, word2, check_sum, data_size;
-    uint32_t        y_offset, u_offset, v_offset, starts[3], ends[3];
+    int             y_offset, u_offset, v_offset;
+    uint32_t        starts[3], ends[3];
     uint16_t        height, width;
     int             i, j;