Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  net: bonding: fix NULL deref in bond_debug_rlb_hash_show  rlb_clear_slave intentionally keeps RLB hash-table entries on the rx_hashtbl_used_head list with slave set to NULL when no replacement slave is available. However, bond_debug_rlb_hash_show visites client_info->slave without checking if it's NULL.  Other used-list iterators in bond_alb.c already handle this NULL-slave state safely:  - rlb_update_client returns early on !client_info->slave - rlb_req_update_slave_clients, rlb_clear_slave, and rlb_rebalance compare slave values before visiting - lb_req_update_subnet_clients continues if slave is NULL  The following NULL deref crash can be trigger in bond_debug_rlb_hash_show:  [    1.289791] BUG: kernel NULL pointer dereference, address: 0000000000000000 [    1.292058] RIP: 0010:bond_debug_rlb_hash_show (drivers/net/bonding/bond_debugfs.c:41) [    1.293101] RSP: 0018:ffffc900004a7d00 EFLAGS: 00010286 [    1.293333] RAX: 0000000000000000 RBX: ffff888102b48200 RCX: ffff888102b48204 [    1.293631] RDX: ffff888102b48200 RSI: ffffffff839daad5 RDI: ffff888102815078 [    1.293924] RBP: ffff888102815078 R08: ffff888102b4820e R09: 0000000000000000 [    1.294267] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100f929c0 [    1.294564] R13: ffff888100f92a00 R14: 0000000000000001 R15: ffffc900004a7ed8 [    1.294864] FS:  0000000001395380(0000) GS:ffff888196e75000(0000) knlGS:0000000000000000 [    1.295239] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [    1.295480] CR2: 0000000000000000 CR3: 0000000102adc004 CR4: 0000000000772ef0 [    1.295897] Call Trace: [    1.296134]  seq_read_iter (fs/seq_file.c:231) [    1.296341]  seq_read (fs/seq_file.c:164) [    1.296493]  full_proxy_read (fs/debugfs/file.c:378 (discriminator 1)) [    1.296658]  vfs_read (fs/read_write.c:572) [    1.296981]  ksys_read (fs/read_write.c:717) [    1.297132]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1)) [    1.297325]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)  Add a NULL check and print "(none)" for entries with no assigned slave.