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| author | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2021-03-12 12:59:47 +0100 |
|---|---|---|
| committer | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2021-03-19 00:41:16 +0100 |
| commit | 9224b1f6b3b554dfc5e941bf106bed06816b328c (patch) | |
| tree | 912845377ac6e3df4f91d0e84646a005a4daf135 /libavformat/mxfdec.c | |
| parent | 5edcdfc318b62b8327565183e8f56b3f8dd2dd16 (diff) | |
| download | ffmpeg-9224b1f6b3b554dfc5e941bf106bed06816b328c.tar.gz | |
avformat/mxfdec: Don't use wrong type of pointer
If one of the two results of a ternary conditional is a pointer to void,
the type of the whole conditional operator is a pointer to void, even
when the other possible result is not a pointer to void. This loophole
in the type system has allowed mxf_read_local_tags to have a pointer of
type pointer to MXFMetadataSet that actually points to an MXFContext.
Reviewed-by: Tomas Härdin <tjoppen@acc.umu.se>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Diffstat (limited to 'libavformat/mxfdec.c')
| -rw-r--r-- | libavformat/mxfdec.c | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c index bb00838a3f..8fea35b86b 100644 --- a/libavformat/mxfdec.c +++ b/libavformat/mxfdec.c @@ -2889,13 +2889,20 @@ static int mxf_metadataset_init(MXFMetadataSet *ctx, enum MXFMetadataSetType typ static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadFunc *read_child, int ctx_size, enum MXFMetadataSetType type) { AVIOContext *pb = mxf->fc->pb; - MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf; uint64_t klv_end = avio_tell(pb) + klv->length; + MXFMetadataSet *meta; + void *ctx; - if (!ctx) - return AVERROR(ENOMEM); - if (ctx_size) - mxf_metadataset_init(ctx, type); + if (ctx_size) { + meta = av_mallocz(ctx_size); + if (!meta) + return AVERROR(ENOMEM); + ctx = meta; + mxf_metadataset_init(meta, type); + } else { + meta = NULL; + ctx = mxf; + } while (avio_tell(pb) + 4 < klv_end && !avio_feof(pb)) { int ret; int tag = avio_rb16(pb); @@ -2922,19 +2929,20 @@ static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadF } } } - if (ctx_size && tag == 0x3C0A) { - avio_read(pb, ctx->uid, 16); + if (meta && tag == 0x3C0A) { + avio_read(pb, meta->uid, 16); } else if ((ret = read_child(ctx, pb, tag, size, uid, -1)) < 0) { - if (ctx_size) - mxf_free_metadataset(&ctx, 1); + if (meta) { + mxf_free_metadataset(&meta, 1); + } return ret; } /* Accept the 64k local set limit being exceeded (Avid). Don't accept * it extending past the end of the KLV though (zzuf5.mxf). */ if (avio_tell(pb) > klv_end) { - if (ctx_size) { - mxf_free_metadataset(&ctx, 1); + if (meta) { + mxf_free_metadataset(&meta, 1); } av_log(mxf->fc, AV_LOG_ERROR, @@ -2944,7 +2952,7 @@ static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, MXFMetadataReadF } else if (avio_tell(pb) <= next) /* only seek forward, else this can loop for a long time */ avio_seek(pb, next, SEEK_SET); } - return ctx_size ? mxf_add_metadata_set(mxf, &ctx) : 0; + return meta ? mxf_add_metadata_set(mxf, &meta) : 0; } /** |