diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index ea7ecab768..1212c6a09b 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -657,9 +657,10 @@ static int avi_read_header(AVFormatContext *s)
                         st->codec->extradata_size += 9;
                         if ((ret = av_reallocp(&st->codec->extradata,
                                                st->codec->extradata_size +
-                                               FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
+                                               FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
+                            st->codec->extradata_size = 0;
                             return ret;
-                        else
+                        } else
                             memcpy(st->codec->extradata + st->codec->extradata_size - 9,
                                    "BottomUp", 9);
                     }
diff --git a/libavformat/avienc.c b/libavformat/avienc.c
index e6d9dae20c..66339af2b0 100644
--- a/libavformat/avienc.c
+++ b/libavformat/avienc.c
@@ -538,8 +538,11 @@ static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
         int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
         int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
         if (idx->ents_allocated <= idx->entry) {
-            if ((err = av_reallocp(&idx->cluster, (cl + 1) * sizeof(*idx->cluster))) < 0)
+            if ((err = av_reallocp(&idx->cluster, (cl + 1) * sizeof(*idx->cluster))) < 0) {
+                idx->ents_allocated = 0;
+                idx->entry = 0;
                 return err;
+            }
             idx->cluster[cl] = av_malloc(AVI_INDEX_CLUSTER_SIZE*sizeof(AVIIentry));
             if (!idx->cluster[cl])
                 return -1;
diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index 3f27d6976c..5064eb826b 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -880,8 +880,11 @@ static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
 
     if (new_allocated_size > d->allocated_size) {
         int err;
-        if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0)
+        if ((err = av_reallocp(&d->buffer, new_allocated_size)) < 0) {
+            d->allocated_size = 0;
+            d->size = 0;
             return err;
+        }
         d->allocated_size = new_allocated_size;
     }
     memcpy(d->buffer + d->pos, buf, buf_size);
diff --git a/libavformat/mmst.c b/libavformat/mmst.c
index 41d01c4fc6..a17b4c12a8 100644
--- a/libavformat/mmst.c
+++ b/libavformat/mmst.c
@@ -337,8 +337,10 @@ static MMSSCPacketType get_tcp_server_response(MMSTContext *mmst)
                 if(!mms->header_parsed) {
                     if ((err = av_reallocp(&mms->asf_header,
                                            mms->asf_header_size +
-                                           mms->remaining_in_len)) < 0)
+                                           mms->remaining_in_len)) < 0) {
+                        mms->asf_header_size = 0;
                         return err;
+                    }
                     memcpy(mms->asf_header + mms->asf_header_size,
                            mms->read_in_ptr, mms->remaining_in_len);
                     mms->asf_header_size += mms->remaining_in_len;
diff --git a/libavformat/mov.c b/libavformat/mov.c
index a84fae84ba..c3d857be4d 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -886,8 +886,10 @@ static int mov_read_extradata(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     size= (uint64_t)st->codec->extradata_size + atom.size + 8 + FF_INPUT_BUFFER_PADDING_SIZE;
     if (size > INT_MAX || (uint64_t)atom.size > INT_MAX)
         return AVERROR_INVALIDDATA;
-    if ((err = av_reallocp(&st->codec->extradata, size)) < 0)
+    if ((err = av_reallocp(&st->codec->extradata, size)) < 0) {
+        st->codec->extradata_size = 0;
         return err;
+    }
     buf = st->codec->extradata + st->codec->extradata_size;
     st->codec->extradata_size= size - FF_INPUT_BUFFER_PADDING_SIZE;
     AV_WB32(       buf    , atom.size + 8);
diff --git a/libavformat/oggparsetheora.c b/libavformat/oggparsetheora.c
index 94e9eba35c..25210ab450 100644
--- a/libavformat/oggparsetheora.c
+++ b/libavformat/oggparsetheora.c
@@ -124,8 +124,10 @@ theora_header (AVFormatContext * s, int idx)
     }
 
     if ((err = av_reallocp(&st->codec->extradata,
-                           cds + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
+                           cds + FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
+        st->codec->extradata_size = 0;
         return err;
+    }
     cdp = st->codec->extradata + st->codec->extradata_size;
     *cdp++ = os->psize >> 8;
     *cdp++ = os->psize & 0xff;
diff --git a/libavformat/oggparsevorbis.c b/libavformat/oggparsevorbis.c
index 1a9776ef15..6e106b0d2b 100644
--- a/libavformat/oggparsevorbis.c
+++ b/libavformat/oggparsevorbis.c
@@ -283,9 +283,12 @@ vorbis_header (AVFormatContext * s, int idx)
             }
         }
     } else {
-        int ret;
-        st->codec->extradata_size =
-            fixup_vorbis_headers(s, priv, &st->codec->extradata);
+        int ret = fixup_vorbis_headers(s, priv, &st->codec->extradata);
+        if (ret < 0) {
+            st->codec->extradata_size = 0;
+            return ret;
+        }
+        st->codec->extradata_size = ret;
         if ((ret = avpriv_vorbis_parse_extradata(st->codec, &priv->vp))) {
             av_freep(&st->codec->extradata);
             st->codec->extradata_size = 0;
diff --git a/libavformat/rdt.c b/libavformat/rdt.c
index d691ae904f..33b0eb827e 100644
--- a/libavformat/rdt.c
+++ b/libavformat/rdt.c
@@ -423,8 +423,10 @@ rdt_parse_sdp_line (AVFormatContext *s, int st_index,
                 if (first == -1) first = n;
                 if (rdt->nb_rmst < count) {
                     if ((err = av_reallocp(&rdt->rmst,
-                                           count * sizeof(*rdt->rmst))) < 0)
+                                           count * sizeof(*rdt->rmst))) < 0) {
+                        rdt->nb_rmst = 0;
                         return err;
+                    }
                     memset(rdt->rmst + rdt->nb_rmst, 0,
                            (count - rdt->nb_rmst) * sizeof(*rdt->rmst));
                     rdt->nb_rmst = count;
diff --git a/libavformat/rtmphttp.c b/libavformat/rtmphttp.c
index 5de1857a28..89a661435c 100644
--- a/libavformat/rtmphttp.c
+++ b/libavformat/rtmphttp.c
@@ -89,8 +89,11 @@ static int rtmp_http_write(URLContext *h, const uint8_t *buf, int size)
     if (rt->out_size + size > rt->out_capacity) {
         int err;
         rt->out_capacity = (rt->out_size + size) * 2;
-        if ((err = av_reallocp(&rt->out_data, rt->out_capacity)) < 0)
+        if ((err = av_reallocp(&rt->out_data, rt->out_capacity)) < 0) {
+            rt->out_size = 0;
+            rt->out_capacity = 0;
             return err;
+        }
     }
 
     memcpy(rt->out_data + rt->out_size, buf, size);
diff --git a/libavformat/rtmpproto.c b/libavformat/rtmpproto.c
index d748a30fe3..05b28a4d04 100644
--- a/libavformat/rtmpproto.c
+++ b/libavformat/rtmpproto.c
@@ -156,8 +156,11 @@ static int add_tracked_method(RTMPContext *rt, const char *name, int id)
     if (rt->nb_tracked_methods + 1 > rt->tracked_methods_size) {
         rt->tracked_methods_size = (rt->nb_tracked_methods + 1) * 2;
         if ((err = av_reallocp(&rt->tracked_methods, rt->tracked_methods_size *
-                               sizeof(*rt->tracked_methods))) < 0)
+                               sizeof(*rt->tracked_methods))) < 0) {
+            rt->nb_tracked_methods = 0;
+            rt->tracked_methods_size = 0;
             return err;
+        }
     }
 
     rt->tracked_methods[rt->nb_tracked_methods].name = av_strdup(name);
diff --git a/libavformat/rtpdec_qt.c b/libavformat/rtpdec_qt.c
index bb0a73b986..2d9c603fcd 100644
--- a/libavformat/rtpdec_qt.c
+++ b/libavformat/rtpdec_qt.c
@@ -174,8 +174,10 @@ static int qt_rtp_parse_packet(AVFormatContext *s, PayloadContext *qt,
         if (qt->pkt.size > 0 && qt->timestamp == *timestamp) {
             int err;
             if ((err = av_reallocp(&qt->pkt.data, qt->pkt.size + alen +
-                                   FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
+                                   FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
+                qt->pkt.size = 0;
                 return err;
+            }
         } else {
             av_freep(&qt->pkt.data);
             av_init_packet(&qt->pkt);
diff --git a/libavformat/smacker.c b/libavformat/smacker.c
index e68c3fd467..5af5e50784 100644
--- a/libavformat/smacker.c
+++ b/libavformat/smacker.c
@@ -315,8 +315,10 @@ static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
                 frame_size -= size;
                 frame_size -= 4;
                 smk->curstream++;
-                if ((err = av_reallocp(&smk->bufs[smk->curstream], size)) < 0)
+                if ((err = av_reallocp(&smk->bufs[smk->curstream], size)) < 0) {
+                    smk->buf_sizes[smk->curstream] = 0;
                     return err;
+                }
                 smk->buf_sizes[smk->curstream] = size;
                 ret = avio_read(s->pb, smk->bufs[smk->curstream], size);
                 if(ret != size)
diff --git a/libavformat/smoothstreamingenc.c b/libavformat/smoothstreamingenc.c
index 9937f498dc..2fe01b1f59 100644
--- a/libavformat/smoothstreamingenc.c
+++ b/libavformat/smoothstreamingenc.c
@@ -450,8 +450,11 @@ static int add_fragment(OutputStream *os, const char *file, const char *infofile
     if (os->nb_fragments >= os->fragments_size) {
         os->fragments_size = (os->fragments_size + 1) * 2;
         if ((err = av_reallocp(&os->fragments, sizeof(*os->fragments) *
-                               os->fragments_size)) < 0)
+                               os->fragments_size)) < 0) {
+            os->fragments_size = 0;
+            os->nb_fragments = 0;
             return err;
+        }
     }
     frag = av_mallocz(sizeof(*frag));
     if (!frag)