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aio: prevent double free in ioctx_alloc 

ioctx_alloc() calls aio_setup_ring() to allocate a ring. If aio_setup_ring()
fails to do so it would call aio_free_ring() before returning, but
ioctx_alloc() would call aio_free_ring() again causing a double free of
the ring.

This is easily reproducible from userspace.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
This commit is contained in:
Sasha Levin 2013-11-19 17:33:02 -05:00 committed by Benjamin LaHaise
parent 13fd8a5dc3
commit d558023207
1 changed files with 0 additions and 1 deletions
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1
fs/aio.c
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@ -610,7 +610,6 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
err_cleanup:
aio_nr_sub(ctx->max_reqs);
err:
aio_free_ring(ctx);
free_percpu(ctx->cpu);
free_percpu(ctx->reqs.pcpu_count);
free_percpu(ctx->users.pcpu_count);