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* [patch] mlx5: use after free in mlx5_cmd_comp_handler()
@ 2013-07-22  8:02 Dan Carpenter
  2013-07-24 16:35 ` Eli Cohen
  0 siblings, 1 reply; 3+ messages in thread
From: Dan Carpenter @ 2013-07-22  8:02 UTC (permalink / raw)
  To: Eli Cohen
  Cc: netdev-u79uwXL29TY76Z2rM5mHXA, linux-rdma-u79uwXL29TY76Z2rM5mHXA,
	kernel-janitors-u79uwXL29TY76Z2rM5mHXA

We can't dereference "ent" after passing it to free_cmd().

Signed-off-by: Dan Carpenter <dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
index 205753a..4037406 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -1113,7 +1113,13 @@ void mlx5_cmd_comp_handler(struct mlx5_core_dev *dev, unsigned long vector)
 
 	for (i = 0; i < (1 << cmd->log_sz); i++) {
 		if (test_bit(i, &vector)) {
+			struct semaphore *sem;
+
 			ent = cmd->ent_arr[i];
+			if (ent->page_queue)
+				sem = &cmd->pages_sem;
+			else
+				sem = &cmd->sem;
 			ktime_get_ts(&ent->ts2);
 			memcpy(ent->out->first.data, ent->lay->out, sizeof(ent->lay->out));
 			dump_command(dev, ent, 0);
@@ -1136,10 +1142,7 @@ void mlx5_cmd_comp_handler(struct mlx5_core_dev *dev, unsigned long vector)
 			} else {
 				complete(&ent->done);
 			}
-			if (ent->page_queue)
-				up(&cmd->pages_sem);
-			else
-				up(&cmd->sem);
+			up(sem);
 		}
 	}
 }
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^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2013-07-24 22:45 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2013-07-22  8:02 [patch] mlx5: use after free in mlx5_cmd_comp_handler() Dan Carpenter
2013-07-24 16:35 ` Eli Cohen
2013-07-24 22:45   ` David Miller

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