[FFmpeg-cvslog] jpeg2000dec: Use the matching coding style struct for transform selection

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Thu Jun  6 15:22:21 2013 +0200| [c49d94487c6135325930cbc4a8cd96d38ef6653e] | committer: Michael Niedermayer

jpeg2000dec: Use the matching coding style struct for transform selection

Fixes a null pointer dereference

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c49d94487c6135325930cbc4a8cd96d38ef6653e
---

 libavcodec/jpeg2000dec.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index fdc0a93..ca4c468 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -1092,6 +1092,7 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
     if (s->precision <= 8) {
         for (compno = 0; compno < s->ncomponents; compno++) {
             Jpeg2000Component *comp = tile->comp + compno;
+            Jpeg2000CodingStyle *codsty = tile->codsty + compno;
             float *datap = comp->f_data;
             int32_t *i_datap = comp->i_data;
             int cbps = s->cbps[compno];
@@ -1105,7 +1106,7 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
                 x   = tile->comp[compno].coord[0][0] - s->image_offset_x;
                 dst = line + x * s->ncomponents + compno;
 
-                if (tile->codsty->transform == FF_DWT97) {
+                if (codsty->transform == FF_DWT97) {
                     for (; x < w; x += s->cdx[compno]) {
                         int val = lrintf(*datap) + (1 << (cbps - 1));
                         /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
@@ -1130,6 +1131,7 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
     } else {
         for (compno = 0; compno < s->ncomponents; compno++) {
             Jpeg2000Component *comp = tile->comp + compno;
+            Jpeg2000CodingStyle *codsty = tile->codsty + compno;
             float *datap = comp->f_data;
             int32_t *i_datap = comp->i_data;
             uint16_t *linel;
@@ -1143,7 +1145,7 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
 
                 x   = tile->comp[compno].coord[0][0] - s->image_offset_x;
                 dst = linel + (x * s->ncomponents + compno);
-                if (tile->codsty->transform == FF_DWT97) {
+                if (codsty->transform == FF_DWT97) {
                     for (; x < w; x += s-> cdx[compno]) {
                         int  val = lrintf(*datap) + (1 << (cbps - 1));
                         /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */