CVE-2023-54156
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).
How to fix
- Linux Linuxcb1aa7cc562cab6a87ea33574c8c65f2d2fd7aeb, 91f4ef204e731565afdc6c2a7fcf509a3fd6fd67, 446f5567934331923d0aec4ce045e4ecb0174aae, 470152d76b3ed107d172ea46acc4bfa941f20b4b, aba32b4c58112960c0c708703ca6b44dc8944082, d1b355438b8325a486f087e506d412c4e852f37b or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | d3142c193dca9a2f6878f4128ce1aaf221bb3f99 ≤ v < cb1aa7cc562cab6a87ea33574c8c65f2d2fd7aeb, d3142c193dca9a2f6878f4128ce1aaf221bb3f99 ≤ v < 91f4ef204e731565afdc6c2a7fcf509a3fd6fd67, d3142c193dca9a2f6878f4128ce1aaf221bb3f99 ≤ v < 446f5567934331923d0aec4ce045e4ecb0174aae, d3142c193dca9a2f6878f4128ce1aaf221bb3f99 ≤ v < 470152d76b3ed107d172ea46acc4bfa941f20b4b, d3142c193dca9a2f6878f4128ce1aaf221bb3f99 ≤ v < aba32b4c58112960c0c708703ca6b44dc8944082, d3142c193dca9a2f6878f4128ce1aaf221bb3f99 ≤ v < d1b355438b8325a486f087e506d412c4e852f37b, 5.9 | cb1aa7cc562cab6a87ea33574c8c65f2d2fd7aeb, 91f4ef204e731565afdc6c2a7fcf509a3fd6fd67, 446f5567934331923d0aec4ce045e4ecb0174aae, 470152d76b3ed107d172ea46acc4bfa941f20b4b, aba32b4c58112960c0c708703ca6b44dc8944082, d1b355438b8325a486f087e506d412c4e852f37b |
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