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Subject[PATCH 4.9 35/96] RDS: null pointer dereference in rds_atomic_free_op
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mohamed Ghannam <simo.ghannam@gmail.com>


[ Upstream commit 7d11f77f84b27cef452cee332f4e469503084737 ]

set rm->atomic.op_active to 0 when rds_pin_pages() fails
or the user supplied address is invalid,
this prevents a NULL pointer usage in rds_atomic_free_op()

Signed-off-by: Mohamed Ghannam <simo.ghannam@gmail.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/rds/rdma.c | 1 +
1 file changed, 1 insertion(+)

--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -876,6 +876,7 @@ int rds_cmsg_atomic(struct rds_sock *rs,
err:
if (page)
put_page(page);
+ rm->atomic.op_active = 0;
kfree(rm->atomic.op_notifier);

return ret;

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