* [PATCH] ceph: fix null pointer dereference
@ 2013-08-05 4:04 Nathaniel Yazdani
2013-08-05 4:14 ` Sage Weil
0 siblings, 1 reply; 2+ messages in thread
From: Nathaniel Yazdani @ 2013-08-05 4:04 UTC (permalink / raw)
To: sage; +Cc: ceph-devel, linux-kernel
When register_session() is given an out-of-range argument for mds,
ceph_mdsmap_get_addr() will return a null pointer, which would be given to
ceph_con_open() & be dereferenced, causing a kernel oops. This fixes bug #4685
in the Ceph bug tracker <http://tracker.ceph.com/issues/4685>.
Signed-off-by: Nathaniel Yazdani <n1ght.4nd.d4y@gmail.com>
---
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 187bf21..ddff072 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -414,6 +414,9 @@ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
{
struct ceph_mds_session *s;
+ if (mds >= mdsc->mdsmap->m_max_mds)
+ return ERR_PTR(-EINVAL);
+
s = kzalloc(sizeof(*s), GFP_NOFS);
if (!s)
return ERR_PTR(-ENOMEM);
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] ceph: fix null pointer dereference
2013-08-05 4:04 [PATCH] ceph: fix null pointer dereference Nathaniel Yazdani
@ 2013-08-05 4:14 ` Sage Weil
0 siblings, 0 replies; 2+ messages in thread
From: Sage Weil @ 2013-08-05 4:14 UTC (permalink / raw)
To: Nathaniel Yazdani; +Cc: ceph-devel, linux-kernel
Looks right, applied to the testing branch.
Thanks!
sage
On Sun, 4 Aug 2013, Nathaniel Yazdani wrote:
> When register_session() is given an out-of-range argument for mds,
> ceph_mdsmap_get_addr() will return a null pointer, which would be given to
> ceph_con_open() & be dereferenced, causing a kernel oops. This fixes bug #4685
> in the Ceph bug tracker <http://tracker.ceph.com/issues/4685>.
>
> Signed-off-by: Nathaniel Yazdani <n1ght.4nd.d4y@gmail.com>
> ---
> diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
> index 187bf21..ddff072 100644
> --- a/fs/ceph/mds_client.c
> +++ b/fs/ceph/mds_client.c
> @@ -414,6 +414,9 @@ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
> {
> struct ceph_mds_session *s;
>
> + if (mds >= mdsc->mdsmap->m_max_mds)
> + return ERR_PTR(-EINVAL);
> +
> s = kzalloc(sizeof(*s), GFP_NOFS);
> if (!s)
> return ERR_PTR(-ENOMEM);
>
>
> --
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>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2013-08-05 4:04 [PATCH] ceph: fix null pointer dereference Nathaniel Yazdani
2013-08-05 4:14 ` Sage Weil
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