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SubjectRe: [PATCH] bfa: fix access to bfad_im_port_s
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On 11/28/2017 04:26 PM, Johannes Thumshirn wrote:
> Commit 'cd21c605b2cf ("scsi: fc: provide fc_bsg_to_shost() helper")'
> changed access to bfa's 'struct bfad_im_port_s' by using shost_priv()
> instead of shost->hostdata[0].
>
> This lead to crashes like in the following back-trace:
>
> task: ffff880046375300 ti: ffff8800a2ef8000 task.ti: ffff8800a2ef8000
> RIP: e030:[<ffffffffa04c8252>] [<ffffffffa04c8252>] bfa_fcport_get_attr+0x82/0x260 [bfa]
> RSP: e02b:ffff8800a2efba10 EFLAGS: 00010046
> RAX: 575f415441536432 RBX: ffff8800a2efba28 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffff8800a2efba28 RDI: ffff880004dc31d8
> RBP: ffff880004dc31d8 R08: 0000000000000000 R09: 0000000000000001
> R10: ffff88011fadc468 R11: 0000000000000001 R12: ffff880004dc31f0
> R13: 0000000000000200 R14: ffff880004dc61d0 R15: ffff880004947a10
> FS: 00007feb1e489700(0000) GS:ffff88011fac0000(0000) knlGS:0000000000000000
> CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 00007ffe14e46c10 CR3: 00000000957b8000 CR4: 0000000000000660
> Stack:
> ffff88001d4da000 ffff880004dc31c0 ffffffffa048a9df ffffffff81e56380
> 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> [] bfad_iocmd_ioc_get_info+0x4f/0x220 [bfa]
> [] bfad_iocmd_handler+0xa00/0xd40 [bfa]
> [] bfad_im_bsg_request+0xee/0x1b0 [bfa]
> [] fc_bsg_dispatch+0x10b/0x1b0 [scsi_transport_fc]
> [] bsg_request_fn+0x11d/0x1c0
> [] __blk_run_queue+0x2f/0x40
> [] blk_execute_rq_nowait+0xa8/0x160
> [] blk_execute_rq+0x77/0x120
> [] bsg_ioctl+0x1b6/0x200
> [] do_vfs_ioctl+0x2cd/0x4a0
> [] SyS_ioctl+0x74/0x80
> [] entry_SYSCALL_64_fastpath+0x12/0x6d
>
> Fixes: cd21c605b2cf ("scsi: fc: provide fc_bsg_to_shost() helper")
> Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
> Cc: Michal Koutný <mkoutny@suse.com>
> ---
> drivers/scsi/bfa/bfad_bsg.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/bfa/bfad_bsg.c b/drivers/scsi/bfa/bfad_bsg.c
> index 72ca2a2e08e2..09ef68c8225f 100644
> --- a/drivers/scsi/bfa/bfad_bsg.c
> +++ b/drivers/scsi/bfa/bfad_bsg.c
> @@ -3135,7 +3135,8 @@ bfad_im_bsg_vendor_request(struct bsg_job *job)
> struct fc_bsg_request *bsg_request = job->request;
> struct fc_bsg_reply *bsg_reply = job->reply;
> uint32_t vendor_cmd = bsg_request->rqst_data.h_vendor.vendor_cmd[0];
> - struct bfad_im_port_s *im_port = shost_priv(fc_bsg_to_shost(job));
> + struct Scsi_Host *shost = fc_bsg_to_shost(job);
> + struct bfad_im_port_s *im_port = shost->hostdata[0];
> struct bfad_s *bfad = im_port->bfad;
> void *payload_kbuf;
> int rc = -EINVAL;
> @@ -3350,7 +3351,8 @@ int
> bfad_im_bsg_els_ct_request(struct bsg_job *job)
> {
> struct bfa_bsg_data *bsg_data;
> - struct bfad_im_port_s *im_port = shost_priv(fc_bsg_to_shost(job));
> + struct Scsi_Host *shost = fc_bsg_to_shost(job);
> + struct bfad_im_port_s *im_port = shost->hostdata[0];
> struct bfad_s *bfad = im_port->bfad;
> bfa_bsg_fcpt_t *bsg_fcpt;
> struct bfad_fcxp *drv_fcxp;
>
Reviewed-by: Hannes Reinecke <hare@suse.com>

Cheers,

Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@suse.de +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)

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