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aio: table lookup: verify ctx pointer

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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>
This commit is contained in:
Benjamin LaHaise 2013-08-07 18:23:48 -04:00
parent 0bdd5ca553
commit f30d704fe1
1 changed files with 1 additions and 1 deletions
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2
fs/aio.c
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@ -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;
}