Rishabh Bhatnagar <risbhat@xxxxxxxxxx> writes: > Recently we have been seeing kernel panic in cifs_reconnect function > while accessing tgt_list. Looks like tgt_list is not initialized > correctly. There are fixes already present in 5.10 and later trees. > Backporting them to 5.4 > > CIFS VFS: \\172.30.1.14 cifs_reconnect: no target servers for DFS > failover > BUG: unable to handle page fault for address: fffffffffffffff8 > #PF: supervisor read access in kernel mode > #PF: error_code(0x0000) - not-present page > PGD 260e067 P4D 260e067 PUD 2610067 PMD 0 > Oops: 0000 [#1] SMP PTI > RIP: 0010:cifs_reconnect+0x51d/0xef0 [cifs] > RSP: 0018:ffffc90000693da0 EFLAGS: 00010282 > RAX: fffffffffffffff8 RBX: ffff8887fa63b800 RCX: fffffffffffffff8 > Call Trace: > cifs_handle_standard+0x18d/0x1b0 [cifs] > cifs_demultiplex_thread+0xa5c/0xc90 [cifs] > kthread+0x113/0x130 > > Paulo Alcantara (2): > cifs: get rid of unused parameter in reconn_setup_dfs_targets() > cifs: handle empty list of targets in cifs_reconnect() > > fs/cifs/connect.c | 15 ++++++++------- > 1 file changed, 8 insertions(+), 7 deletions(-) Looks good.
