On 11/21/18 1:25 AM, Nilesh Javali wrote:
> From: Manish Rangankar <manish.rangan...@cavium.com>
>
> The kernel panic was observed after switch side perturbation,
>
> BUG: unable to handle kernel NULL pointer dereference at (null)
> IP: [<ffffffff8132b5a0>] strcmp+0x20/0x40
> PGD 0 Oops: 0000 [#1] SMP
> CPU: 8 PID: 647 Comm: kworker/8:1 Tainted: G W OE ------------
> 3.10.0-693.el7.x86_64 #1
> Hardware name: HPE ProLiant DL380 Gen10/ProLiant DL380 Gen10, BIOS U30
> 06/20/2018
> Workqueue: slowpath-13:00. qed_slowpath_task [qed]
> task: ffff880429eb8fd0 ti: ffff880429190000 task.ti: ffff880429190000
> RIP: 0010:[<ffffffff8132b5a0>] [<ffffffff8132b5a0>] strcmp+0x20/0x40
> RSP: 0018:ffff880429193c68 EFLAGS: 00010202
> RAX: 000000000000000a RBX: 0000000000000002 RCX: 0000000000000000
> RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff88042bda7a41
> RBP: ffff880429193c68 R08: 000000000000ffff R09: 000000000000ffff
> R10: 0000000000000007 R11: ffff88042b3af338 R12: ffff880420b007a0
> R13: ffff88081aa56af8 R14: 0000000000000001 R15: ffff88081aa50410
> FS: 0000000000000000(0000) GS:ffff88042fe00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 00000000019f2000 CR4: 00000000003407e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Stack:
> ffff880429193d20 ffffffffc02a0c90 ffffc90004b32000 ffff8803fd3ec600
> ffff88042bda7800 ffff88042bda7a00 ffff88042bda7840 ffff88042bda7a40
> 0000000129193d10 2e3836312e323931 ff000a342e363232 ffffffffc01ad99d
> Call Trace:
> [<ffffffffc02a0c90>] qedi_get_protocol_tlv_data+0x270/0x470 [qedi]
> [<ffffffffc01ad99d>] ? qed_mfw_process_tlv_req+0x24d/0xbf0 [qed]
> [<ffffffffc01653ae>] qed_mfw_fill_tlv_data+0x5e/0xd0 [qed]
> [<ffffffffc01ad9b9>] qed_mfw_process_tlv_req+0x269/0xbf0 [qed]
>
> Fix kernel NULL pointer deref by checking for session is online
> before getting iSCSI TLV data.
>
> Signed-off-by: Manish Rangankar <manish.rangan...@cavium.com>
> ---
> drivers/scsi/qedi/qedi_main.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/scsi/qedi/qedi_main.c b/drivers/scsi/qedi/qedi_main.c
> index 5308e6b..713db9c 100644
> --- a/drivers/scsi/qedi/qedi_main.c
> +++ b/drivers/scsi/qedi/qedi_main.c
> @@ -952,6 +952,9 @@ static int qedi_find_boot_info(struct qedi_ctx *qedi,
> cls_sess = iscsi_conn_to_session(cls_conn);
> sess = cls_sess->dd_data;
>
> + if (!iscsi_is_session_online(cls_sess))
> + continue;
> +
> if (pri_ctrl_flags) {
> if (!strcmp(pri_tgt->iscsi_name, sess->targetname) &&
> !strcmp(pri_tgt->ip_addr, ep_ip_addr)) {
>
Reviewed-by: Lee Duncan <ldun...@suse.com>
