diff options
| author | Dan Rosenberg <drosenberg@vsecurity.com> | 2010-09-15 11:43:12 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-09-26 17:18:17 -0700 |
| commit | 79872c1916caaebb002448f63455050cfde581cf (patch) | |
| tree | 9cb5fec26da9e0f1882ccc08e60533f260cf4af8 | |
| parent | 9df2a1a9348fe1098e55ca3899963a60419c12d8 (diff) | |
drivers/net/cxgb3/cxgb3_main.c: prevent reading uninitialized stack memory
commit 49c37c0334a9b85d30ab3d6b5d1acb05ef2ef6de upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/net/cxgb3/cxgb3_main.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c index e3f1b856649..3e0f19f75c8 100644 --- a/drivers/net/cxgb3/cxgb3_main.c +++ b/drivers/net/cxgb3/cxgb3_main.c @@ -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))) |