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| author | Maxim Korotkov <korotkov.maxim.s@gmail.com> | 2022-11-22 15:29:01 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-11-24 07:03:51 +0300 |
| commit | 64a8f8f7127da228d59a39e2c5e75f86590f90b4 (patch) | |
| tree | c917c726746d4b2ce0d7f63f0b58d5bf5ceb9c53 | |
| parent | 2094dbbd82f9ef180385e6466f03c40a98a7dfde (diff) | |
| download | linux-64a8f8f7127da228d59a39e2c5e75f86590f90b4.tar.xz | |
ethtool: avoiding integer overflow in ethtool_phys_id()
The value of an arithmetic expression "n * id.data" is subject
to possible overflow due to a failure to cast operands to a larger data
type before performing arithmetic. Used macro for multiplication instead
operator for avoiding overflow.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Signed-off-by: Maxim Korotkov <korotkov.maxim.s@gmail.com>
Reviewed-by: Alexander Lobakin <alexandr.lobakin@intel.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20221122122901.22294-1-korotkov.maxim.s@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | net/ethtool/ioctl.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c index 99272a67525c..c2f1a542e6fa 100644 --- a/net/ethtool/ioctl.c +++ b/net/ethtool/ioctl.c @@ -2013,7 +2013,8 @@ static int ethtool_phys_id(struct net_device *dev, void __user *useraddr) } else { /* Driver expects to be called at twice the frequency in rc */ int n = rc * 2, interval = HZ / n; - u64 count = n * id.data, i = 0; + u64 count = mul_u32_u32(n, id.data); + u64 i = 0; do { rtnl_lock(); |