> -----Original Message----- > From: mroos@xxxxxxxxxx [mailto:mroos@xxxxxxxxxx] On Behalf Of Meelis > Roos > Sent: Thursday, February 08, 2018 11:58 PM > To: linux-scsi@xxxxxxxxxxxxxxx; dl-esc-Aacraid Linux Driver > <aacraid@xxxxxxxxxxxxx> > Subject: [PATCH] aacraid: fix shutdown crash when init fails > > > When aacraid init fails with "AAC0: adapter self-test failed.", shutdown leads to > UBSAN warning and then oops: > > [154316.118423] > ================================================================= > =============== > [154316.118508] UBSAN: Undefined behaviour in drivers/scsi/scsi_lib.c:2328:27 > [154316.118566] member access within null pointer of type 'struct Scsi_Host' > [154316.118631] CPU: 2 PID: 14530 Comm: reboot Tainted: G W 4.15.0- > dirty #89 > [154316.118701] Hardware name: Hewlett Packard HP NetServer/HP System > Board, BIOS 4.06.46 PW 06/25/2003 [154316.118774] Call Trace: > [154316.118848] dump_stack+0x48/0x65 > [154316.118916] ubsan_epilogue+0xe/0x40 [154316.118976] > __ubsan_handle_type_mismatch+0xfb/0x180 > [154316.119043] scsi_block_requests+0x20/0x30 [154316.119135] > aac_shutdown+0x18/0x40 [aacraid] [154316.119196] > pci_device_shutdown+0x33/0x50 [154316.119269] > device_shutdown+0x18a/0x390 [...] [154316.123435] BUG: unable to handle > kernel NULL pointer dereference at 000000f4 [154316.123515] IP: > scsi_block_requests+0xa/0x30 > > This is because aac_shutdown() does > > struct Scsi_Host *shost = pci_get_drvdata(dev); > scsi_block_requests(shost); > > and that assumes shost has been assigned with pci_set_drvdata(). > > However, pci_set_drvdata(pdev, shost) is done in aac_probe_one() far after > bailing out with error from calling the init function > ((*aac_drivers[index].init)(aac)), and when the init function fails, no error is > returned from aac_probe_one() so PCI layer assumes there is driver attached, > and tries to shut it down later. > > Fix it by returning error from aac_probe_one() when card-specific init function > fails. > > This fixes reboot on my HP NetRAID-4M with dead battery. > > Signed-off-by: Meelis Roos <mroos@xxxxxxxx> Reviewed-by: Dave Carroll <david.carroll@xxxxxxxxxxxxx>
