[PATCH 1/5] lightnvm: Fix uninitialized pointer in nvm_remove_tgt()

[Geert Uytterhoeven]

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>
---
 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 0df7454832efe082..aa017f48eb8c588c 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -492,7 +492,7 @@ 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;
 
 	down_read(&nvm_lock);
-- 
2.17.1