[ 016/262] Bluetooth: RFCOMM - Fix info leak in ioctl(RFCOMMGETDEVLIST)

From: Greg Kroah-Hartman
Date: Fri Sep 28 2012 - 16:07:48 EST


From: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>

3.5-stable review patch. If anyone has any objections, please let me know.

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


From: Mathias Krause <minipli@xxxxxxxxxxxxxx>

[ Upstream commit f9432c5ec8b1e9a09b9b0e5569e3c73db8de432a ]

The RFCOMM code fails to initialize the two padding bytes of struct
rfcomm_dev_list_req inserted for alignment before copying it to
userland. Additionally there are two padding bytes in each instance of
struct rfcomm_dev_info. The ioctl() that for disclosures two bytes plus
dev_num times two bytes uninitialized kernel heap memory.

Allocate the memory using kzalloc() to fix this issue.

Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Cc: Marcel Holtmann <marcel@xxxxxxxxxxxx>
Cc: Gustavo Padovan <gustavo@xxxxxxxxxxx>
Cc: Johan Hedberg <johan.hedberg@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/bluetooth/rfcomm/tty.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -461,7 +461,7 @@ static int rfcomm_get_dev_list(void __us

size = sizeof(*dl) + dev_num * sizeof(*di);

- dl = kmalloc(size, GFP_KERNEL);
+ dl = kzalloc(size, GFP_KERNEL);
if (!dl)
return -ENOMEM;



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