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[188.192.137.96]) by smtp.gmail.com with ESMTPSA id hd37sm2562042ejc.114.2021.03.12.05.07.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Mar 2021 05:07:41 -0800 (PST) From: Andreas Rheinhardt To: ffmpeg-devel@ffmpeg.org Date: Fri, 12 Mar 2021 14:07:32 +0100 Message-Id: <20210312130733.1980124-1-andreas.rheinhardt@gmail.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH 1/2] avformat/mxfdec: Don't use wrong type of pointer X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: Andreas Rheinhardt Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" 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. Signed-off-by: Andreas Rheinhardt --- libavformat/mxfdec.c | 32 +++++++++++++++++++------------- 1 file changed, 19 insertions(+), 13 deletions(-) diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c index bb00838a3f..d7213bda30 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); @@ -2922,20 +2929,19 @@ 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, "local tag %#04x extends past end of local set @ %#"PRIx64"\n", @@ -2944,7 +2950,7 @@ 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; } /**