[FFmpeg-cvslog] avcodec/hevc: Fix integer overflow of entry_point_offset

[Michael Niedermayer]

ffmpeg | branch: release/2.4 | Michael Niedermayer <michael at niedermayer.cc> | Sat Dec  5 22:08:59 2015 +0100| [bafd5c3c80a4a9ee8f5c0e67320c6e0bf3869101] | committer: Michael Niedermayer

avcodec/hevc: Fix integer overflow of entry_point_offset

Fixes out of array read
Fixes: d41d8cd98f00b204e9800998ecf8427e/signal_sigsegv_321165b_7641_077dfcd8cbc80b1c0b470c8554cd6ffb.bit

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 214085852491448631dcecb008b5d172c11b8892)

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bafd5c3c80a4a9ee8f5c0e67320c6e0bf3869101
---

 libavcodec/hevc.c |    4 ++--
 libavcodec/hevc.h |    2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/libavcodec/hevc.c b/libavcodec/hevc.c
index 5c530b7..85a0db8 100644
--- a/libavcodec/hevc.c
+++ b/libavcodec/hevc.c
@@ -696,7 +696,7 @@ static int hls_slice_header(HEVCContext *s)
             av_freep(&sh->entry_point_offset);
             av_freep(&sh->offset);
             av_freep(&sh->size);
-            sh->entry_point_offset = av_malloc_array(sh->num_entry_point_offsets, sizeof(int));
+            sh->entry_point_offset = av_malloc_array(sh->num_entry_point_offsets, sizeof(unsigned));
             sh->offset = av_malloc_array(sh->num_entry_point_offsets, sizeof(int));
             sh->size = av_malloc_array(sh->num_entry_point_offsets, sizeof(int));
             if (!sh->entry_point_offset || !sh->offset || !sh->size) {
@@ -2410,7 +2410,7 @@ static int hls_slice_data_wpp(HEVCContext *s, const uint8_t *nal, int length)
     int *ret = av_malloc_array(s->sh.num_entry_point_offsets + 1, sizeof(int));
     int *arg = av_malloc_array(s->sh.num_entry_point_offsets + 1, sizeof(int));
     int64_t offset;
-    int startheader, cmpt = 0;
+    int64_t startheader, cmpt = 0;
     int i, j, res = 0;
 
     ff_alloc_entries(s->avctx, s->sh.num_entry_point_offsets + 1);
diff --git a/libavcodec/hevc.h b/libavcodec/hevc.h
index 7efafe1..c71ab550 100644
--- a/libavcodec/hevc.h
+++ b/libavcodec/hevc.h
@@ -607,7 +607,7 @@ typedef struct SliceHeader {
 
     unsigned int max_num_merge_cand; ///< 5 - 5_minus_max_num_merge_cand
 
-    int *entry_point_offset;
+    unsigned *entry_point_offset;
     int * offset;
     int * size;
     int num_entry_point_offsets;