Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:net/smc: fix wrong list_del in smc_lgr_cleanup_earlysmc_lgr_cleanup_early() meant to delete the linkgroup from the link group list, but it deletedthe list head by mistake.This may cause memory corruption since we didn'tremove the real link group from the list and latermemseted the link group structure.We got a list corruption panic when testing:  231.277259] list_del corruption. prev->next should be ffff8881398a8000, but was 0000000000000000[  231.278222] ------------[ cut here ]------------[  231.278726] kernel BUG at lib/list_debug.c:53![  231.279326] invalid opcode: 0000 [#1] SMP NOPTI[  231.279803] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.10.46+ #435[  231.280466] Hardware name: Alibaba Cloud ECS, BIOS 8c24b4c 04/01/2014[  231.281248] Workqueue: events smc_link_down_work[  231.281732] RIP: 0010:__list_del_entry_valid+0x70/0x90[  231.282258] Code: 4c 60 82 e8 7d cc 6a 00 0f 0b 48 89 fe 48 c7 c7 88 4c60 82 e8 6c cc 6a 00 0f 0b 48 89 fe 48 c7 c7 c0 4c 60 82 e8 5b cc 6a 00 <0f>0b 48 89 fe 48 c7 c7 00 4d 60 82 e8 4a cc 6a 00 0f 0b cc cc cc[  231.284146] RSP: 0018:ffffc90000033d58 EFLAGS: 00010292[  231.284685] RAX: 0000000000000054 RBX: ffff8881398a8000 RCX: 0000000000000000[  231.285415] RDX: 0000000000000001 RSI: ffff88813bc18040 RDI: ffff88813bc18040[  231.286141] RBP: ffffffff8305ad40 R08: 0000000000000003 R09: 0000000000000001[  231.286873] R10: ffffffff82803da0 R11: ffffc90000033b90 R12: 0000000000000001[  231.287606] R13: 0000000000000000 R14: ffff8881398a8000 R15: 0000000000000003[  231.288337] FS:  0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000[  231.289160] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033[  231.289754] CR2: 0000000000e72058 CR3: 000000010fa96006 CR4: 00000000003706f0[  231.290485] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000[  231.291211] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400[  231.291940] Call Trace:[  231.292211]  smc_lgr_terminate_sched+0x53/0xa0[  231.292677]  smc_switch_conns+0x75/0x6b0[  231.293085]  ? update_load_avg+0x1a6/0x590[  231.293517]  ? ttwu_do_wakeup+0x17/0x150[  231.293907]  ? update_load_avg+0x1a6/0x590[  231.294317]  ? newidle_balance+0xca/0x3d0[  231.294716]  smcr_link_down+0x50/0x1a0[  231.295090]  ? __wake_up_common_lock+0x77/0x90[  231.295534]  smc_link_down_work+0x46/0x60[  231.295933]  process_one_work+0x18b/0x350

CREATE(Triage):(User=admin) [CVE-2021-47536 (https://nvd.nist.gov/vuln/detail/CVE-2021-47536)

CVEs

• CVE-2021-47536