ffmpeg: fix CVE-2023-50007

Buffer Overflow vulnerability in Ffmpeg v.n6.1-3-g466799d4f5 allows a local attacker
to execute arbitrary code via theav_samples_set_silence function in the
libavutil/samplefmt.c:260:9 component.

(From OE-Core rev: 88a1fc5a6445e72e6cc78c39a6feff3aa96beea6)

Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 79 insertions, 0 deletions

diff --git a/meta/recipes-multimedia/ffmpeg/ffmpeg/CVE-2023-50007.patch b/meta/recipes-multimedia/ffmpeg/ffmpeg/CVE-2023-50007.patch
new file mode 100644
index 0000000000..fd4dc486ee
--- /dev/null
+++ b/meta/recipes-multimedia/ffmpeg/ffmpeg/CVE-2023-50007.patch
@@ -0,0 +1,78 @@
+From b1942734c7cbcdc9034034373abcc9ecb9644c47 Mon Sep 17 00:00:00 2001
+From: Paul B Mahol <onemda@gmail.com>
+Date: Mon, 27 Nov 2023 11:45:34 +0100
+Subject: [PATCH 2/4] avfilter/af_afwtdn: fix crash with EOF handling
+
+CVE: CVE-2023-50007
+
+Upstream-Status: Backport [https://github.com/FFmpeg/FFmpeg/commit/b1942734c7cbcdc9034034373abcc9ecb9644c47]
+
+Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
+---
+ libavfilter/af_afwtdn.c | 34 +++++++++++++++++++---------------
+ 1 file changed, 19 insertions(+), 15 deletions(-)
+
+diff --git a/libavfilter/af_afwtdn.c b/libavfilter/af_afwtdn.c
+index 09b504d..1839190 100644
+--- a/libavfilter/af_afwtdn.c
++++ b/libavfilter/af_afwtdn.c
+@@ -410,6 +410,7 @@ typedef struct AudioFWTDNContext {
+
+     uint64_t sn;
+     int64_t eof_pts;
++    int eof;
+
+     int wavelet_type;
+     int channels;
+@@ -1071,7 +1072,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+         s->drop_samples = 0;
+     } else {
+         if (s->padd_samples < 0 && eof) {
+-            out->nb_samples += s->padd_samples;
++            out->nb_samples = FFMAX(0, out->nb_samples + s->padd_samples);
+             s->padd_samples = 0;
+         }
+         if (!eof)
+@@ -1210,23 +1211,26 @@ static int activate(AVFilterContext *ctx)
+
+     FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
+
+-    ret = ff_inlink_consume_samples(inlink, s->nb_samples, s->nb_samples, &in);
+-    if (ret < 0)
+-        return ret;
+-    if (ret > 0)
+-        return filter_frame(inlink, in);
++    if (!s->eof) {
++        ret = ff_inlink_consume_samples(inlink, s->nb_samples, s->nb_samples, &in);
++        if (ret < 0)
++            return ret;
++        if (ret > 0)
++            return filter_frame(inlink, in);
++    }
+
+     if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
+-        if (status == AVERROR_EOF) {
+-            while (s->padd_samples != 0) {
+-                ret = filter_frame(inlink, NULL);
+-                if (ret < 0)
+-                    return ret;
+-            }
+-            ff_outlink_set_status(outlink, status, pts);
+-            return ret;
+-        }
++        if (status == AVERROR_EOF)
++            s->eof = 1;
+     }
++
++    if (s->eof && s->padd_samples != 0) {
++        return filter_frame(inlink, NULL);
++    } else if (s->eof) {
++        ff_outlink_set_status(outlink, AVERROR_EOF, s->eof_pts);
++        return 0;
++    }
++
+     FF_FILTER_FORWARD_WANTED(outlink, inlink);
+
+     return FFERROR_NOT_READY;
+--
+2.40.0
diff --git a/meta/recipes-multimedia/ffmpeg/ffmpeg_5.0.1.bb b/meta/recipes-multimedia/ffmpeg/ffmpeg_5.0.1.bb
index d233ced662..ee13081e4d 100644
--- a/meta/recipes-multimedia/ffmpeg/ffmpeg_5.0.1.bb
+++ b/meta/recipes-multimedia/ffmpeg/ffmpeg_5.0.1.bb
@@ -37,6 +37,7 @@ SRC_URI = "https://www.ffmpeg.org/releases/${BP}.tar.xz \
            file://CVE-2023-51794.patch \
            file://CVE-2023-51798.patch \
            file://CVE-2023-47342.patch \
+           file://CVE-2023-50007.patch \
           "
 
 SRC_URI[sha256sum] = "ef2efae259ce80a240de48ec85ecb062cecca26e4352ffb3fda562c21a93007b"