CVE-2022-49625

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> sfc: fix kernel panic when creating VF<br /> <br /> When creating VFs a kernel panic can happen when calling to<br /> efx_ef10_try_update_nic_stats_vf.<br /> <br /> When releasing a DMA coherent buffer, sometimes, I don&amp;#39;t know in what<br /> specific circumstances, it has to unmap memory with vunmap. It is<br /> disallowed to do that in IRQ context or with BH disabled. Otherwise, we<br /> hit this line in vunmap, causing the crash:<br /> BUG_ON(in_interrupt());<br /> <br /> This patch reenables BH to release the buffer.<br /> <br /> Log messages when the bug is hit:<br /> kernel BUG at mm/vmalloc.c:2727!<br /> invalid opcode: 0000 [#1] PREEMPT SMP NOPTI<br /> CPU: 6 PID: 1462 Comm: NetworkManager Kdump: loaded Tainted: G I --------- --- 5.14.0-119.el9.x86_64 #1<br /> Hardware name: Dell Inc. PowerEdge R740/06WXJT, BIOS 2.8.2 08/27/2020<br /> RIP: 0010:vunmap+0x2e/0x30<br /> ...skip...<br /> Call Trace:<br /> __iommu_dma_free+0x96/0x100<br /> efx_nic_free_buffer+0x2b/0x40 [sfc]<br /> efx_ef10_try_update_nic_stats_vf+0x14a/0x1c0 [sfc]<br /> efx_ef10_update_stats_vf+0x18/0x40 [sfc]<br /> efx_start_all+0x15e/0x1d0 [sfc]<br /> efx_net_open+0x5a/0xe0 [sfc]<br /> __dev_open+0xe7/0x1a0<br /> __dev_change_flags+0x1d7/0x240<br /> dev_change_flags+0x21/0x60<br /> ...skip...