CVE-2023-54274

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> RDMA/srpt: Add a check for valid &amp;#39;mad_agent&amp;#39; pointer<br /> <br /> When unregistering MAD agent, srpt module has a non-null check<br /> for &amp;#39;mad_agent&amp;#39; pointer before invoking ib_unregister_mad_agent().<br /> This check can pass if &amp;#39;mad_agent&amp;#39; variable holds an error value.<br /> The &amp;#39;mad_agent&amp;#39; can have an error value for a short window when<br /> srpt_add_one() and srpt_remove_one() is executed simultaneously.<br /> <br /> In srpt module, added a valid pointer check for &amp;#39;sport-&gt;mad_agent&amp;#39;<br /> before unregistering MAD agent.<br /> <br /> This issue can hit when RoCE driver unregisters ib_device<br /> <br /> Stack Trace:<br /> ------------<br /> BUG: kernel NULL pointer dereference, address: 000000000000004d<br /> PGD 145003067 P4D 145003067 PUD 2324fe067 PMD 0<br /> Oops: 0002 [#1] PREEMPT SMP NOPTI<br /> CPU: 10 PID: 4459 Comm: kworker/u80:0 Kdump: loaded Tainted: P<br /> Hardware name: Dell Inc. PowerEdge R640/06NR82, BIOS 2.5.4 01/13/2020<br /> Workqueue: bnxt_re bnxt_re_task [bnxt_re]<br /> RIP: 0010:_raw_spin_lock_irqsave+0x19/0x40<br /> Call Trace:<br /> ib_unregister_mad_agent+0x46/0x2f0 [ib_core]<br /> IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready<br /> ? __schedule+0x20b/0x560<br /> srpt_unregister_mad_agent+0x93/0xd0 [ib_srpt]<br /> srpt_remove_one+0x20/0x150 [ib_srpt]<br /> remove_client_context+0x88/0xd0 [ib_core]<br /> bond0: (slave p2p1): link status definitely up, 100000 Mbps full duplex<br /> disable_device+0x8a/0x160 [ib_core]<br /> bond0: active interface up!<br /> ? kernfs_name_hash+0x12/0x80<br /> (NULL device *): Bonding Info Received: rdev: 000000006c0b8247<br /> __ib_unregister_device+0x42/0xb0 [ib_core]<br /> (NULL device *): Master: mode: 4 num_slaves:2<br /> ib_unregister_device+0x22/0x30 [ib_core]<br /> (NULL device *): Slave: id: 105069936 name:p2p1 link:0 state:0<br /> bnxt_re_stopqps_and_ib_uninit+0x83/0x90 [bnxt_re]<br /> bnxt_re_alloc_lag+0x12e/0x4e0 [bnxt_re]