[PATCH] bluetooth: fix leak of uninitialized data to userspace
From: Vegard Nossum
Date: Sun Oct 05 2008 - 11:25:45 EST
struct hci_dev_list_req {
__u16 dev_num;
struct hci_dev_req dev_req[0]; /* hci_dev_req structures */
};
sizeof(struct hci_dev_list_req) == 4, so the two bytes immediately
following "dev_num" will never be initialized. When this structure
is copied to userspace, these uninitialized bytes are leaked.
Fix by using kzalloc() instead of kmalloc(). Found using kmemcheck.
Signed-off-by: Vegard Nossum <vegard.nossum@xxxxxxxxx>
---
net/bluetooth/hci_core.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 278a3ac..7bb0f1c 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -756,7 +756,7 @@ int hci_get_dev_list(void __user *arg)
size = sizeof(*dl) + dev_num * sizeof(*dr);
- if (!(dl = kmalloc(size, GFP_KERNEL)))
+ if (!(dl = kzalloc(size, GFP_KERNEL)))
return -ENOMEM;
dr = dl->dev_req;
--
1.5.5.1
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