On Wed 19 Jan 15:21 PST 2022, Alistair Delva wrote:

Check count for 0, to avoid a potential underflow. Make the check the same as the one in rproc_recovery_write().

Fixes: 3afdc59e4390 ("remoteproc: Add coredump debugfs entry") Signed-off-by: Alistair Delva adelva@google.com Cc: Rishabh Bhatnagar rishabhb@codeaurora.org Cc: stable@vger.kernel.org Cc: Ohad Ben-Cohen ohad@wizery.com Cc: Bjorn Andersson bjorn.andersson@linaro.org Cc: Mathieu Poirier mathieu.poirier@linaro.org Cc: Sibi Sankar sibis@codeaurora.org Cc: linux-remoteproc@vger.kernel.org Cc: kernel-team@android.com

Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org

Regards, Bjorn

---

drivers/remoteproc/remoteproc_debugfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/remoteproc/remoteproc_debugfs.c b/drivers/remoteproc/remoteproc_debugfs.c index b5a1e3b697d9..581930483ef8 100644 --- a/drivers/remoteproc/remoteproc_debugfs.c +++ b/drivers/remoteproc/remoteproc_debugfs.c @@ -76,7 +76,7 @@ static ssize_t rproc_coredump_write(struct file *filp, int ret, err = 0; char buf[20];

• if (count > sizeof(buf))

• if (count < 1 || count > sizeof(buf)) return -EINVAL;

ret = copy_from_user(buf, user_buf, count); -- 2.30.2