CVE-2022-49378

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

sfc: fix considering that all channels have TX queues

Normally, all channels have RX and TX queues, but this is not true if

modparam efx_separate_tx_channels=1 is used. In that cases, some

channels only have RX queues and others only TX queues (or more

preciselly, they have them allocated, but not initialized).

Fix efx_channel_has_tx_queues to return the correct value for this case

too.

Messages shown at probe time before the fix:

sfc 0000:03:00.0 ens6f0np0: MC command 0x82 inlen 544 failed rc=-22 (raw=0) arg=0

------------[ cut here ]------------

netdevice: ens6f0np0: failed to initialise TXQ -1

WARNING: CPU: 1 PID: 626 at drivers/net/ethernet/sfc/ef10.c:2393 efx_ef10_tx_init+0x201/0x300 [sfc]

[...] stripped

RIP: 0010:efx_ef10_tx_init+0x201/0x300 [sfc]

[...] stripped

Call Trace:

efx_init_tx_queue+0xaa/0xf0 [sfc]

efx_start_channels+0x49/0x120 [sfc]

efx_start_all+0x1f8/0x430 [sfc]

efx_net_open+0x5a/0

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References