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[FFmpeg-devel,v3,1/1] return value check for init_get_bits in vc1dec.c

Message ID PAXP193MB12623F4DDD87D1487DA1808CB6FC9@PAXP193MB1262.EURP193.PROD.OUTLOOK.COM
State New
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Series [FFmpeg-devel,v3,1/1] return value check for init_get_bits in vc1dec.c | expand

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Commit Message

Maryam Ebrahimzadeh Aug. 15, 2021, 11:50 a.m. UTC 
Return value check: return value check for init_get_bits in vc1dec.c

As the second argument for init_get_bits(avctx and buf) can be crafted,
 a return value check for this function call is necessary
 so replace init_get_bits with init_get_bits8.

---
 libavcodec/vc1dec.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

Comments

Nicolas George Aug. 15, 2021, 12:14 p.m. UTC | #1 
maryam ebrahimzadeh (12021-08-15):
> Return value check: return value check for init_get_bits in vc1dec.c

See:

https://ffmpeg.org/pipermail/ffmpeg-devel/2021-August/283780.html

Regards,
Paul B Mahol Aug. 15, 2021, 12:21 p.m. UTC | #2 
Please make  patch subject like: avcodec/vc1dec: return value check for ..
diff mbox series

Patch

diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index 1fb1950ade..0f7c07f2e8 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -444,7 +444,9 @@  static av_cold int vc1_decode_init(AVCodecContext *avctx)
         // the last byte of the extradata is a version number, 1 for the
         // samples we can decode
 
-        init_get_bits(&gb, avctx->extradata, avctx->extradata_size*8);
+        ret = init_get_bits8(&gb, avctx->extradata, avctx->extradata_size);
+        if (ret < 0)
+            return ret;
 
         if ((ret = ff_vc1_decode_sequence_header(avctx, v, &gb)) < 0)
           return ret;
@@ -770,8 +772,11 @@  static int vc1_decode_frame(AVCodecContext *avctx, void *data,
             buf_size2 = vc1_unescape_buffer(buf, buf_size, buf2);
         }
         init_get_bits(&s->gb, buf2, buf_size2*8);
-    } else
-        init_get_bits(&s->gb, buf, buf_size*8);
+    } else {
+        ret = init_get_bits8(&s->gb, buf, buf_size);
+        if (ret < 0)
+            return ret;
+    }
 
     if (v->res_sprite) {
         v->new_sprite  = !get_bits1(&s->gb);