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drivers/net/cxgb3/cxgb3_main.c: prevent reading uninitialized stack memory 

Fixed formatting (tabs and line breaks).

The CHELSIO_GET_QSET_NUM device ioctl allows unprivileged users to read
4 bytes of uninitialized stack memory, because the "addr" member of the
ch_reg struct declared on the stack in cxgb_extension_ioctl() is not
altered or zeroed before being copied back to the user.  This patch
takes care of it.

Signed-off-by: Dan Rosenberg <dan.j.rosenberg@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Rosenberg 2010-09-15 11:43:12 +00:00 committed by David S. Miller
parent 44467187dc
commit 49c37c0334
1 changed files with 2 additions and 0 deletions
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2
drivers/net/cxgb3/cxgb3_main.c
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@ -2296,6 +2296,8 @@ static int cxgb_extension_ioctl(struct net_device *dev, void __user *useraddr)
case CHELSIO_GET_QSET_NUM:{
struct ch_reg edata;
memset(&edata, 0, sizeof(struct ch_reg));
edata.cmd = CHELSIO_GET_QSET_NUM;
edata.val = pi->nqsets;
if (copy_to_user(useraddr, &edata, sizeof(edata)))