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ethtool: ioctl: Fix out-of-bounds warning in store_link_ksettings_for_user()

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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@intel.com>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gustavo A. R. Silva 2021-04-16 15:15:40 -05:00 committed by David S. Miller
parent ca9c54d2d6
commit c1d9e34e11
1 changed files with 1 additions and 1 deletions
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2
net/ethtool/ioctl.c
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@ -489,7 +489,7 @@ 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);