[FFmpeg-cvslog] tools/target_enc_fuzzer: Only read pix_fmts if its set

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun May  5 03:14:26 2024 +0200| [24bd01ea65eb5a9902a0ce8e38f82dcec7117f87] | committer: Michael Niedermayer

tools/target_enc_fuzzer: Only read pix_fmts if its set

Fixes: null pointer dereference
Fixes: rawvideo encoder

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=24bd01ea65eb5a9902a0ce8e38f82dcec7117f87
---

 tools/target_enc_fuzzer.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/tools/target_enc_fuzzer.c b/tools/target_enc_fuzzer.c
index 1749f6905b..0345595ada 100644
--- a/tools/target_enc_fuzzer.c
+++ b/tools/target_enc_fuzzer.c
@@ -130,10 +130,12 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 
         flags64 = bytestream2_get_le64(&gbc);
 
-        int npixfmts = 0;
-        while (c->p.pix_fmts[npixfmts++] != AV_PIX_FMT_NONE)
-            ;
-        ctx->pix_fmt = c->p.pix_fmts[bytestream2_get_byte(&gbc) % npixfmts];
+        if (c->p.pix_fmts) {
+            int npixfmts = 0;
+            while (c->p.pix_fmts[npixfmts++] != AV_PIX_FMT_NONE)
+                ;
+            ctx->pix_fmt = c->p.pix_fmts[bytestream2_get_byte(&gbc) % npixfmts];
+        }
 
         switch (c->p.id) {
         case AV_CODEC_ID_FFV1:{