avcodec/mpegvideo: Fix memleak upon allocation error

When slice-threading is used, ff_mpv_common_init() duplicates
the first MpegEncContext and allocates some buffers for each
MpegEncContext (the first as well as the copies). But the count of
allocated MpegEncContexts is not updated until after everything has
been allocated and if an error happens after the first one has been
allocated, only the first one is freed; the others leak.

This commit fixes this: The count is now set before the copies are
allocated. Furthermore, the copies are now created and initialized
before the first MpegEncContext, so that the buffers exclusively owned
by each MpegEncContext are still NULL in the src MpegEncContext so
that no double-free happens upon allocation failure.

Given that this effectively touches every line of the init code,
it has also been factored out in a function of its own in order to
remove code duplication with the same code in
ff_mpv_common_frame_size_change() (which was never called when using
more than one slice (and if it were, there would be potential
double-frees)).

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/mpegvideo.c

@@ -366,13 +366,6 @@ static int init_duplicate_context(MpegEncContext *s)
     if (s->mb_height & 1)
         yc_size += 2*s->b8_stride + 2*s->mb_stride;
 
-    s->sc.edge_emu_buffer =
-    s->me.scratchpad   =
-    s->me.temp         =
-    s->sc.rd_scratchpad   =
-    s->sc.b_scratchpad    =
-    s->sc.obmc_scratchpad = NULL;
-
     if (s->encoding) {
         if (!FF_ALLOCZ_TYPED_ARRAY(s->me.map,       ME_MAP_SIZE) ||
             !FF_ALLOCZ_TYPED_ARRAY(s->me.score_map, ME_MAP_SIZE))
@@ -413,6 +406,35 @@ static int init_duplicate_context(MpegEncContext *s)
     return 0;
 }
 
+/**
+ * Initialize an MpegEncContext's thread contexts. Presumes that
+ * slice_context_count is already set and that all the fields
+ * that are freed/reset in free_duplicate_context() are NULL.
+ */
+static int init_duplicate_contexts(MpegEncContext *s)
+{
+    int nb_slices = s->slice_context_count, ret;
+
+    /* We initialize the copies before the original so that
+     * fields allocated in init_duplicate_context are NULL after
+     * copying. This prevents double-frees upon allocation error. */
+    for (int i = 1; i < nb_slices; i++) {
+        s->thread_context[i] = av_memdup(s, sizeof(MpegEncContext));
+        if (!s->thread_context[i])
+            return AVERROR(ENOMEM);
+        if ((ret = init_duplicate_context(s->thread_context[i])) < 0)
+            return ret;
+        s->thread_context[i]->start_mb_y =
+            (s->mb_height * (i    ) + nb_slices / 2) / nb_slices;
+        s->thread_context[i]->end_mb_y   =
+            (s->mb_height * (i + 1) + nb_slices / 2) / nb_slices;
+    }
+    s->start_mb_y = 0;
+    s->end_mb_y   = nb_slices > 1 ? (s->mb_height + nb_slices / 2) / nb_slices
+                                  : s->mb_height;
+    return init_duplicate_context(s);
+}
+
 static void free_duplicate_context(MpegEncContext *s)
 {
     if (!s)
@@ -949,29 +971,12 @@ av_cold int ff_mpv_common_init(MpegEncContext *s)
     s->context_initialized = 1;
     memset(s->thread_context, 0, sizeof(s->thread_context));
     s->thread_context[0]   = s;
+    s->slice_context_count = nb_slices;
 
 //     if (s->width && s->height) {
-    if (nb_slices > 1) {
-        for (i = 0; i < nb_slices; i++) {
-            if (i) {
-                s->thread_context[i] = av_memdup(s, sizeof(MpegEncContext));
-                if (!s->thread_context[i])
-                    goto fail_nomem;
-            }
-            if ((ret = init_duplicate_context(s->thread_context[i])) < 0)
-                goto fail;
-            s->thread_context[i]->start_mb_y =
-                (s->mb_height * (i) + nb_slices / 2) / nb_slices;
-            s->thread_context[i]->end_mb_y   =
-                (s->mb_height * (i + 1) + nb_slices / 2) / nb_slices;
-        }
-    } else {
-        if ((ret = init_duplicate_context(s)) < 0)
+    ret = init_duplicate_contexts(s);
+    if (ret < 0)
         goto fail;
-        s->start_mb_y = 0;
-        s->end_mb_y   = s->mb_height;
-    }
-    s->slice_context_count = nb_slices;
 //     }
 
     return 0;
@@ -1088,31 +1093,9 @@ int ff_mpv_common_frame_size_change(MpegEncContext *s)
     s->thread_context[0]   = s;
 
     if (s->width && s->height) {
-        int nb_slices = s->slice_context_count;
-        if (nb_slices > 1) {
-            for (i = 0; i < nb_slices; i++) {
-                if (i) {
-                    s->thread_context[i] = av_memdup(s, sizeof(MpegEncContext));
-                    if (!s->thread_context[i]) {
-                        err = AVERROR(ENOMEM);
-                        goto fail;
-                    }
-                }
-                if ((err = init_duplicate_context(s->thread_context[i])) < 0)
-                    goto fail;
-                s->thread_context[i]->start_mb_y =
-                    (s->mb_height * (i) + nb_slices / 2) / nb_slices;
-                s->thread_context[i]->end_mb_y   =
-                    (s->mb_height * (i + 1) + nb_slices / 2) / nb_slices;
-            }
-        } else {
-            err = init_duplicate_context(s);
+        err = init_duplicate_contexts(s);
         if (err < 0)
             goto fail;
-            s->start_mb_y = 0;
-            s->end_mb_y   = s->mb_height;
-        }
-        s->slice_context_count = nb_slices;
     }
 
     return 0;