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authorBenjamin LaHaise <bcrl@kvack.org>2013-08-07 18:23:48 -0400
committerBenjamin LaHaise <bcrl@kvack.org>2013-08-07 18:23:48 -0400
commitf30d704fe1244c44a984d3d1f47bc648bcc6c9f7 (patch)
treee10cb0106ea097cd5e8a406f0f59e38b0e714547
parent0bdd5ca553ebc15060dd72684710e0a0af4481b4 (diff)
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>
-rw-r--r--fs/aio.c2
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;
}