CVE-2022-49869

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

bnxten: Fix possible crash in bnxthwrmsetcoal()

During the error recovery sequence, the rtnllock is not held for the entire duration and some datastructures may be freed during the sequence. Check for the BNXTSTATEOPEN flag instead of netifrunning() to ensure that the device is fully operational before proceeding to reconfigure the coalescing settings.

This will fix a possible crash like this:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 PGD 0 P4D 0 Oops: 0000 [#1] SMP NOPTI CPU: 10 PID: 181276 Comm: ethtool Kdump: loaded Tainted: G IOE --------- - - 4.18.0-348.el8.x8664 #1 Hardware name: Dell Inc. PowerEdge R740/0F9N89, BIOS 2.3.10 08/15/2019 RIP: 0010:bnxthwrmsetcoal+0x1fb/0x2a0 [bnxten] Code: c2 66 83 4e 22 08 66 89 46 1c e8 10 cb 00 00 41 83 c6 01 44 39 b3 68 01 00 00 0f 8e a3 00 00 00 48 8b 93 c8 00 00 00 49 63 c6 <48> 8b 2c c2 48 8b 85 b8 02 00 00 48 85 c0 74 2e 48 8b 74 24 08 f6 RSP: 0018:ffffb11c8dcaba50 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8d168a8b0ac0 RCX: 00000000000000c5 RDX: 0000000000000000 RSI: ffff8d162f72c000 RDI: ffff8d168a8b0b28 RBP: 0000000000000000 R08: b6e1f68a12e9a7eb R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000037 R12: ffff8d168a8b109c R13: ffff8d168a8b10aa R14: 0000000000000000 R15: ffffffffc01ac4e0 FS: 00007f3852e4c740(0000) GS:ffff8d24c0080000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000041b3ee003 CR4: 00000000007706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: ethnlsetcoalesce+0x3ce/0x4c0 genlfamilyrcvmsgdoit.isra.15+0x10f/0x150 genlfamilyrcvmsg+0xb3/0x160 ? coalescefillreply+0x480/0x480 genlrcvmsg+0x47/0x90 ? genlfamilyrcvmsg+0x160/0x160 netlinkrcvskb+0x4c/0x120 genlrcv+0x24/0x40 netlinkunicast+0x196/0x230 netlinksendmsg+0x204/0x3d0 socksendmsg+0x4c/0x50 _syssendto+0xee/0x160 ? syscalltraceenter+0x1d3/0x2c0 ? _auditsyscallexit+0x249/0x2a0 _x64syssendto+0x24/0x30 dosyscall64+0x5b/0x1a0 entrySYSCALL64after_hwframe+0x65/0xca RIP: 0033:0x7f38524163bb