[FFmpeg-cvslog] avcodec/v4l2_buffers: Fix infinite loop

[Andriy Gelman]

ffmpeg | branch: master | Andriy Gelman <andriy.gelman at gmail.com> | Sun Oct 27 00:19:46 2019 -0400| [1aec1183f3e82e9aa20fe23d961f663c1efc45fb] | committer: Aman Gupta

avcodec/v4l2_buffers: Fix infinite loop

This part of the code counts the number of planes returned by the v4l2
device for each queried capture/output buffer.
When testing the GPU h264 encoder on Nvidia's Jetson Nano, this caused an
infinite loop because avbuf->buf.length included some empty buffers (i.e.
where avbuf->buf.m.planes[i].length = 0), meaning that the counter was
never incremented and break was never reached.
This is fixed in the commit by using a well defined iteration range.

Signed-off-by: Aman Gupta <aman at tmm1.net>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1aec1183f3e82e9aa20fe23d961f663c1efc45fb
---

 libavcodec/v4l2_buffers.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/libavcodec/v4l2_buffers.c b/libavcodec/v4l2_buffers.c
index e301dcd6bd..dc1b9eaf24 100644
--- a/libavcodec/v4l2_buffers.c
+++ b/libavcodec/v4l2_buffers.c
@@ -511,11 +511,9 @@ int ff_v4l2_buffer_initialize(V4L2Buffer* avbuf, int index)
 
     if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
         avbuf->num_planes = 0;
-        for (;;) {
-            /* in MP, the V4L2 API states that buf.length means num_planes */
-            if (avbuf->num_planes >= avbuf->buf.length)
-                break;
-            if (avbuf->buf.m.planes[avbuf->num_planes].length)
+        /* in MP, the V4L2 API states that buf.length means num_planes */
+        for (i = 0; i < avbuf->buf.length; i++) {
+            if (avbuf->buf.m.planes[i].length)
                 avbuf->num_planes++;
         }
     } else