lib/genalloc.c: check result of devres_alloc()

devm_gen_pool_create() calls devres_alloc() and dereferences its result
without checking whether devres_alloc() succeeded.  Check for error and
bail out if it happened.

Coverity-id 1016493.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/genalloc.c b/lib/genalloc.c
index 0fe1cbe87700..d214866eeea2 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -586,6 +586,8 @@ struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order,
         struct gen_pool **ptr, *pool;
 
         ptr = devres_alloc(devm_gen_pool_release, sizeof(*ptr), GFP_KERNEL);
+        if (!ptr)
+                return NULL;
 
         pool = gen_pool_create(min_alloc_order, nid);
         if (pool) {