[PATCH 5.2 135/413] lightnvm: fix uninitialized pointer in nvm_remove_tgt()

From: Greg Kroah-Hartman
Date: Wed Jul 24 2019 - 15:29:10 EST

[ Upstream commit 2f5af4ab7de14bd35f3435e6a47300276bbb6c17 ]

With gcc 4.1:

drivers/lightnvm/core.c: In function ânvm_remove_tgtâ:
drivers/lightnvm/core.c:510: warning: âtâ is used uninitialized in this function

Indeed, if no NVM devices have been registered, t will be an
uninitialized pointer, and may be dereferenced later. A call to
nvm_remove_tgt() can be triggered from userspace by issuing the
NVM_DEV_REMOVE ioctl on the lightnvm control device.

Fix this by preinitializing t to NULL.

Fixes: 843f2edbdde085b4 ("lightnvm: do not remove instance under global lock")
Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Matias BjÃrling <mb@xxxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/lightnvm/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 7d555b110ecd..a600934fdd9c 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -478,7 +478,7 @@ static void __nvm_remove_target(struct nvm_target *t, bool graceful)
static int nvm_remove_tgt(struct nvm_ioctl_remove *remove)
- struct nvm_target *t;
+ struct nvm_target *t = NULL;
struct nvm_dev *dev;