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Message-Id: <1384900383-22009-1-git-send-email-sasha.levin@oracle.com> Date: Tue, 19 Nov 2013 17:33:02 -0500 From: Sasha Levin <sasha.levin@...cle.com> To: bcrl@...ck.org, viro@...iv.linux.org.uk Cc: linux-aio@...ck.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, Sasha Levin <sasha.levin@...cle.com> Subject: [PATCH 1/2] 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@...cle.com> --- fs/aio.c | 1 - 1 file changed, 1 deletion(-) diff --git a/fs/aio.c b/fs/aio.c index 699f53e..8b387a1 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -661,7 +661,6 @@ 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); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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