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dlm: NULL dereference on failure in kmem_cache_create() 

We aren't allowed to pass NULL pointers to kmem_cache_destroy() so if
both allocations fail, it leads to a NULL dereference.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Dan Carpenter 2012-05-15 11:58:12 +03:00 committed by David Teigland
parent 1a058f5288
commit 75af271ed5
1 changed files with 3 additions and 5 deletions
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8
fs/dlm/memory.c
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@ -21,21 +21,19 @@ static struct kmem_cache *rsb_cache;
int __init dlm_memory_init(void) int __init dlm_memory_init(void)
{ {
int ret = 0;
lkb_cache = kmem_cache_create("dlm_lkb", sizeof(struct dlm_lkb), lkb_cache = kmem_cache_create("dlm_lkb", sizeof(struct dlm_lkb),
__alignof__(struct dlm_lkb), 0, NULL); __alignof__(struct dlm_lkb), 0, NULL);
if (!lkb_cache) if (!lkb_cache)
ret = -ENOMEM; return -ENOMEM;
rsb_cache = kmem_cache_create("dlm_rsb", sizeof(struct dlm_rsb), rsb_cache = kmem_cache_create("dlm_rsb", sizeof(struct dlm_rsb),
__alignof__(struct dlm_rsb), 0, NULL); __alignof__(struct dlm_rsb), 0, NULL);
if (!rsb_cache) { if (!rsb_cache) {
kmem_cache_destroy(lkb_cache); kmem_cache_destroy(lkb_cache);
ret = -ENOMEM; return -ENOMEM;
} }
return ret; return 0;
} }
void dlm_memory_exit(void) void dlm_memory_exit(void)