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lightnvm: fix uninitialized pointer in nvm_remove_tgt()

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With gcc 4.1:

    drivers/lightnvm/core.c: In function ‘nvm_remove_tgt’:
    drivers/lightnvm/core.c:510: warning: ‘t’ 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: 843f2edbdd ("lightnvm: do not remove instance under global lock")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Geert Uytterhoeven 2019-06-21 11:12:00 +02:00 committed by Jens Axboe
parent 510fd8ea98
commit 2f5af4ab7d
1 changed files with 1 additions and 1 deletions
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2
drivers/lightnvm/core.c
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@ -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;
down_read(&nvm_lock);