avformat/avc, mxfenc: Avoid allocation of H264 SPS structure, fix memleak

Up until now, ff_avc_decode_sps would parse a SPS and return some
properties from it in a freshly allocated structure. Yet said structure
is very small and completely internal to libavformat, so there is no
reason to use the heap for it. This commit therefore changes the
function to return an int and to modify a caller-provided structure.
This will also allow ff_avc_decode_sps to return better error codes in
the future.

It also fixes a memleak in mxfenc: If a packet contained multiple SPS,
only the SPS structure belonging to the last SPS would be freed, the
other ones would leak when the pointer is overwritten to point to the
new SPS structure. Of course, without allocations there are no leaks.
This is Coverity issue #1445194.

Furthermore, the SPS structure has been renamed from
H264SequenceParameterSet to H264SPS in order to avoid overlong lines.

Reviewed-by: Tomas Härdin <tjoppen@acc.umu.se>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

1 files changed, 7 insertions, 8 deletions

diff --git a/libavformat/mxfenc.c b/libavformat/mxfenc.c
index c3b6809e98..5a3a609bf6 100644
--- a/libavformat/mxfenc.c
+++ b/libavformat/mxfenc.c
@@ -2171,14 +2171,14 @@ static int mxf_parse_h264_frame(AVFormatContext *s, AVStream *st,
 {
     MXFContext *mxf = s->priv_data;
     MXFStreamContext *sc = st->priv_data;
-    H264SequenceParameterSet *sps = NULL;
+    H264SPS seq, *const sps = &seq;
     GetBitContext gb;
     const uint8_t *buf = pkt->data;
     const uint8_t *buf_end = pkt->data + pkt->size;
     const uint8_t *nal_end;
     uint32_t state = -1;
     int extra_size = 512; // support AVC Intra files without SPS/PPS header
-    int i, frame_size, slice_type, intra_only = 0;
+    int i, frame_size, slice_type, has_sps = 0, intra_only = 0, ret;
 
     for (;;) {
         buf = avpriv_find_start_code(buf, buf_end, &state);
@@ -2193,11 +2193,12 @@ static int mxf_parse_h264_frame(AVFormatContext *s, AVStream *st,
                 break;
 
             nal_end = ff_avc_find_startcode(buf, buf_end);
-            sps = ff_avc_decode_sps(buf, nal_end - buf);
-            if (!sps) {
+            ret = ff_avc_decode_sps(sps, buf, nal_end - buf);
+            if (ret < 0) {
                 av_log(s, AV_LOG_ERROR, "error parsing sps\n");
                 return 0;
             }
+            has_sps = 1;
 
             sc->aspect_ratio.num = st->codecpar->width * sps->sar.num;
             sc->aspect_ratio.den = st->codecpar->height * sps->sar.den;
@@ -2243,7 +2244,7 @@ static int mxf_parse_h264_frame(AVFormatContext *s, AVStream *st,
     if (mxf->header_written)
         return 1;
 
-    if (!sps)
+    if (!has_sps)
         sc->interlaced = st->codecpar->field_order != AV_FIELD_PROGRESSIVE ? 1 : 0;
     sc->codec_ul = NULL;
     frame_size = pkt->size + extra_size;
@@ -2260,7 +2261,7 @@ static int mxf_parse_h264_frame(AVFormatContext *s, AVStream *st,
             if (sc->interlaced)
                 sc->field_dominance = 1; // top field first is mandatory for AVC Intra
             break;
-        } else if (sps && mxf_h264_codec_uls[i].frame_size == 0 &&
+        } else if (has_sps && mxf_h264_codec_uls[i].frame_size == 0 &&
                    mxf_h264_codec_uls[i].profile == sps->profile_idc &&
                    (mxf_h264_codec_uls[i].intra_only < 0 ||
                     mxf_h264_codec_uls[i].intra_only == intra_only)) {
@@ -2271,8 +2272,6 @@ static int mxf_parse_h264_frame(AVFormatContext *s, AVStream *st,
         }
     }
 
-    av_free(sps);
-
     if (!sc->codec_ul) {
         av_log(s, AV_LOG_ERROR, "h264 profile not supported\n");
         return 0;