[PATCH 5.4 09/61] media: zr364xx: propagate errors from zr364xx_start_readpipe()

Sasha Levin
2021-08-24T17:14:53Z

From: Evgeny Novikov <novikov@ispras.ru>

[ Upstream commit af0321a5be3e5647441eb6b79355beaa592df97a ]

zr364xx_start_readpipe() can fail but callers do not care about that.
This can result in various negative consequences. The patch adds missed
error handling.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@ispras.ru>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/usb/zr364xx/zr364xx.c | 31 ++++++++++++++++++++++-------
1 file changed, 24 insertions(+), 7 deletions(-)

diff --git a/drivers/media/usb/zr364xx/zr364xx.c b/drivers/media/usb/zr364xx/zr364xx.c
index 02458c9cb5dc..22b34690a016 100644
--- a/drivers/media/usb/zr364xx/zr364xx.c
+++ b/drivers/media/usb/zr364xx/zr364xx.c
@@ -1331,6 +1331,7 @@ static int zr364xx_board_init(struct zr364xx_camera *cam)
{
struct zr364xx_pipeinfo *pipe = cam->pipe;
unsigned long i;
+ int err;

DBG("board init: %p\n", cam);
memset(pipe, 0, sizeof(*pipe));
@@ -1363,9 +1364,8 @@ static int zr364xx_board_init(struct zr364xx_camera *cam)

if (i == 0) {
printk(KERN_INFO KBUILD_MODNAME ": out of memory. Aborting\n");
- kfree(cam->pipe->transfer_buffer);
- cam->pipe->transfer_buffer = NULL;
- return -ENOMEM;
+ err = -ENOMEM;
+ goto err_free;
} else
cam->buffer.dwFrames = i;

@@ -1380,9 +1380,17 @@ static int zr364xx_board_init(struct zr364xx_camera *cam)
/*** end create system buffers ***/

/* start read pipe */
- zr364xx_start_readpipe(cam);
+ err = zr364xx_start_readpipe(cam);
+ if (err)
+ goto err_free;
+
DBG(": board initialized\n");
return 0;
+
+err_free:
+ kfree(cam->pipe->transfer_buffer);
+ cam->pipe->transfer_buffer = NULL;
+ return err;
}

static int zr364xx_probe(struct usb_interface *intf,
@@ -1579,10 +1587,19 @@ static int zr364xx_resume(struct usb_interface *intf)
if (!cam->was_streaming)
return 0;

- zr364xx_start_readpipe(cam);
+ res = zr364xx_start_readpipe(cam);
+ if (res)
+ return res;
+
res = zr364xx_prepare(cam);
- if (!res)
- zr364xx_start_acquire(cam);
+ if (res)
+ goto err_prepare;
+
+ zr364xx_start_acquire(cam);
+ return 0;
+
+err_prepare:
+ zr364xx_stop_readpipe(cam);
return res;
}
#endif
--
2.30.2