aio: table lookup: verify ctx pointer

Another shortcoming of the table lookup patch was revealed where the pointer
was not being tested before being dereferenced.  Verify this to avoid the
NULL pointer dereference.

Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/aio.c b/fs/aio.c
index 3bc068c1cb9c..c3f005dc2d55 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -812,7 +812,7 @@ static struct kioctx *lookup_ioctx(unsigned long ctx_id)
                 goto out;
 
         ctx = table->table[id];
-        if (ctx->user_id == ctx_id) {
+        if (ctx && ctx->user_id == ctx_id) {
                 percpu_ref_get(&ctx->users);
                 ret = ctx;
         }