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>
diff --git a/fs/aio.c b/fs/aio.c
index 3bc068c..c3f005d 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -812,7 +812,7 @@
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;
}