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| author | Gustavo A. R. Silva <gustavoars@kernel.org> | 2021-04-16 15:15:40 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-04-19 15:27:37 -0700 |
| commit | c1d9e34e11281a8ba1a1c54e4db554232a461488 (patch) | |
| tree | c71b56fcfe4e5863f9ca5f2db6ea24a80f2a1026 /net/ethtool | |
| parent | ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f (diff) | |
| download | linux-c1d9e34e11281a8ba1a1c54e4db554232a461488.tar.bz2 | |
ethtool: ioctl: Fix out-of-bounds warning in store_link_ksettings_for_user()
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>
Diffstat (limited to 'net/ethtool')
| -rw-r--r-- | net/ethtool/ioctl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c index 27f1c5224acb..3fa7a394eabf 100644 --- a/net/ethtool/ioctl.c +++ b/net/ethtool/ioctl.c @@ -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); |