[FFmpeg-cvslog] avcodec/g2meet: fix error returns

[Michael Niedermayer]

ffmpeg | branch: release/2.2 | Michael Niedermayer <michaelni at gmx.at> | Sun Mar  2 15:16:37 2014 +0100| [4b7c149306cf36aeed379063fe656d48deb9c93b] | committer: Michael Niedermayer

avcodec/g2meet: fix error returns

Fixes out of array accesses

This should not affect any release

Fixes: 8ab69af9e5a7a7e20fe04cdd25c0d6e7-asan_heap-oob_e72b82_5505_cov_2278389485_g2m4.wmv
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 6b53c1aa822e9c92be52a462dd0aef1c2010ce73)

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4b7c149306cf36aeed379063fe656d48deb9c93b
---

 libavcodec/g2meet.c |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/libavcodec/g2meet.c b/libavcodec/g2meet.c
index beeb392..7275011 100644
--- a/libavcodec/g2meet.c
+++ b/libavcodec/g2meet.c
@@ -717,7 +717,8 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
                 av_log(avctx, AV_LOG_ERROR,
                        "Unknown compression method %d\n",
                        c->compression);
-                return AVERROR_PATCHWELCOME;
+                ret = AVERROR_PATCHWELCOME;
+                goto header_fail;
             }
             c->tile_width  = bytestream2_get_be32(&bc);
             c->tile_height = bytestream2_get_be32(&bc);
@@ -737,7 +738,8 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
                     (chunk_size - 21) < 16 ) {
                     av_log(avctx, AV_LOG_ERROR,
                            "Display info: missing bitmasks!\n");
-                    return AVERROR_INVALIDDATA;
+                    ret = AVERROR_INVALIDDATA;
+                    goto header_fail;
                 }
                 r_mask = bytestream2_get_be32(&bc);
                 g_mask = bytestream2_get_be32(&bc);
@@ -746,11 +748,13 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
                     av_log(avctx, AV_LOG_ERROR,
                            "Invalid or unsupported bitmasks: R=%X, G=%X, B=%X\n",
                            r_mask, g_mask, b_mask);
-                    return AVERROR_PATCHWELCOME;
+                    ret = AVERROR_PATCHWELCOME;
+                    goto header_fail;
                 }
             } else {
                 avpriv_request_sample(avctx, "bpp=%d", c->bpp);
-                return AVERROR_PATCHWELCOME;
+                ret = AVERROR_PATCHWELCOME;
+                goto header_fail;
             }
             if (g2m_init_buffers(c)) {
                 ret = AVERROR(ENOMEM);