Description
In the Linux kernel, the following vulnerability has been resolved: sfc: fix crash when reading stats while NIC is resetting efx_net_stats() (.ndo_get_stats64) can be called during an ethtool selftest, during which time nic_data->mc_stats is NULL as the NIC has been fini'd. In this case do not attempt to fetch the latest stats from the hardware, else we will crash on a NULL dereference: BUG: kernel NULL pointer dereference, address: 0000000000000038 RIP efx_nic_update_stats abridged calltrace: efx_ef10_update_stats_pf efx_net_stats dev_get_stats dev_seq_printf_stats Skipping the read is safe, we will simply give out stale stats. To ensure that the free in efx_ef10_fini_nic() does not race against efx_ef10_update_stats_pf(), which could cause a TOCTTOU bug, take the efx->stats_lock in fini_nic (it is already held across update_stats).
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
d3142c193dca9a2f6878f4128ce1aaf221bb3f99 to < cb1aa7cc562cab6a87ea33574c8c65f2d2fd7aebaffectedd3142c193dca9a2f6878f4128ce1aaf221bb3f99 to < 91f4ef204e731565afdc6c2a7fcf509a3fd6fd67affectedd3142c193dca9a2f6878f4128ce1aaf221bb3f99 to < 446f5567934331923d0aec4ce045e4ecb0174aaeaffectedd3142c193dca9a2f6878f4128ce1aaf221bb3f99 to < 470152d76b3ed107d172ea46acc4bfa941f20b4baffectedd3142c193dca9a2f6878f4128ce1aaf221bb3f99 to < aba32b4c58112960c0c708703ca6b44dc8944082affectedd3142c193dca9a2f6878f4128ce1aaf221bb3f99 to < d1b355438b8325a486f087e506d412c4e852f37baffected
Linux Linux
Default version status: affected
5.9affected0 to < 5.9unaffected5.10.188 to ≤ 5.10.*unaffected5.15.121 to ≤ 5.15.*unaffected6.1.39 to ≤ 6.1.*unaffected6.3.13 to ≤ 6.3.*unaffected6.4.4 to ≤ 6.4.*unaffected6.5 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/cb1aa7cc562cab6a87ea33574c8c65f2d2fd7aeb ↗
- https://git.kernel.org/stable/c/91f4ef204e731565afdc6c2a7fcf509a3fd6fd67 ↗
- https://git.kernel.org/stable/c/446f5567934331923d0aec4ce045e4ecb0174aae ↗
- https://git.kernel.org/stable/c/470152d76b3ed107d172ea46acc4bfa941f20b4b ↗
- https://git.kernel.org/stable/c/aba32b4c58112960c0c708703ca6b44dc8944082 ↗
- https://git.kernel.org/stable/c/d1b355438b8325a486f087e506d412c4e852f37b ↗