gpu: nvgpu: initialize local variable

Initialize character array buf in gk20a_channel_ioctl() to zero
Keeping it uninitialized can result in leaking kernel stack
info to user space since we pass this buffer to UMD

Bug 1793398

Change-Id: Iffd654dbaca3b4e3c8fd2ac270d0febd01c165b8
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1195862
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
index 447fe86a..85b77199 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_gk20a.c
@@ -3008,7 +3008,7 @@ long gk20a_channel_ioctl(struct file *filp,
 {
         struct channel_gk20a *ch = filp->private_data;
         struct device *dev = ch->g->dev;
-        u8 buf[NVGPU_IOCTL_CHANNEL_MAX_ARG_SIZE];
+        u8 buf[NVGPU_IOCTL_CHANNEL_MAX_ARG_SIZE] = {0};
         int err = 0;
 
         gk20a_dbg_fn("start %d", _IOC_NR(cmd));