The "channel" is added to the "dev->channels" but then if
v4l2_m2m_ctx_init() fails then we free "channel" but it's still on the
list so it could lead to a use after free. Let's not add it to the
list until after v4l2_m2m_ctx_init() succeeds.
Fixes: cc62c74749a3 ("media: allegro: add missed checks in allegro_open()")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
>From static analysis. Not tested.
drivers/staging/media/allegro-dvt/allegro-core.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/staging/media/allegro-dvt/allegro-core.c b/drivers/staging/media/allegro-dvt/allegro-core.c
index 9f718f43282b..640451134072 100644
--- a/drivers/staging/media/allegro-dvt/allegro-core.c
+++ b/drivers/staging/media/allegro-dvt/allegro-core.c
@@ -2483,8 +2483,6 @@ static int allegro_open(struct file *file)
INIT_LIST_HEAD(&channel->buffers_reference);
INIT_LIST_HEAD(&channel->buffers_intermediate);
- list_add(&channel->list, &dev->channels);
-
channel->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, channel,
allegro_queue_init);
@@ -2493,6 +2491,7 @@ static int allegro_open(struct file *file)
goto error;
}
+ list_add(&channel->list, &dev->channels);
file->private_data = &channel->fh;
v4l2_fh_add(&channel->fh);
--
2.29.2
