[PATCH AUTOSEL 4.19 25/32] ethtool: ioctl: Fix out-of-bounds warning in store_link_ksettings_for_user()

From: Sasha Levin
Date: Wed May 05 2021 - 13:11:18 EST


From: "Gustavo A. R. Silva" <gustavoars@xxxxxxxxxx>

[ Upstream commit c1d9e34e11281a8ba1a1c54e4db554232a461488 ]

Fix the following out-of-bounds warning:

net/ethtool/ioctl.c:492:2: warning: 'memcpy' offset [49, 84] from the object at 'link_usettings' is out of the bounds of referenced subobject 'base' with type 'struct ethtool_link_settings' at offset 0 [-Warray-bounds]

The problem is that the original code is trying to copy data into a
some struct members adjacent to each other in a single call to
memcpy(). This causes a legitimate compiler warning because memcpy()
overruns the length of &link_usettings.base. Fix this by directly
using &link_usettings and _from_ as destination and source addresses,
instead.

This helps with the ongoing efforts to globally enable -Warray-bounds
and get us closer to being able to tighten the FORTIFY_SOURCE routines
on memcpy().

Link: https://github.com/KSPP/linux/issues/109
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/core/ethtool.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 1011625a0ca4..83028017c26d 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -618,7 +618,7 @@ store_link_ksettings_for_user(void __user *to,
{
struct ethtool_link_usettings link_usettings;

- memcpy(&link_usettings.base, &from->base, sizeof(link_usettings));
+ memcpy(&link_usettings, from, sizeof(link_usettings));
bitmap_to_arr32(link_usettings.link_modes.supported,
from->link_modes.supported,
__ETHTOOL_LINK_MODE_MASK_NBITS);
--
2.30.2