mempool_alloc() may return NULL if __GFP_DIRECT_RECLAIM is not set in
gfp_mask under memory pressure. So we should check the return value of
mempool_alloc() against NULL before dereference.
Fixes: a892c8d52c02 ("block: Inline encryption support for blk-mq")
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
block/blk-crypto.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/block/blk-crypto.c b/block/blk-crypto.c
index 2d5e60023b08..046aff85cfa3 100644
--- a/block/blk-crypto.c
+++ b/block/blk-crypto.c
@@ -98,7 +98,8 @@ void __bio_crypt_free_ctx(struct bio *bio)
void __bio_crypt_clone(struct bio *dst, struct bio *src, gfp_t gfp_mask)
{
dst->bi_crypt_context = mempool_alloc(bio_crypt_ctx_pool, gfp_mask);
- *dst->bi_crypt_context = *src->bi_crypt_context;
+ if (likely(dst->bi_crypt_context))
+ *dst->bi_crypt_context = *src->bi_crypt_context;
}
EXPORT_SYMBOL_GPL(__bio_crypt_clone);
--
2.19.1
