New: BUG: unable to handle kernel NULL pointer dereference (in scsi_send_eh_cmnd)
https://bugzilla.kernel.org/show_bug.cgi?id=43085
Summary: BUG: unable to handle kernel NULL pointer dereference
(in scsi_send_eh_cmnd)
Product: SCSI Drivers
Version: 2.5
Kernel Version: 3.4-rc2
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Other
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: Yes
Created an attachment (id=72868)
--> (https://bugzilla.kernel.org/attachment.cgi?id=72868)
BUG - unable to handle kernel NULL pointer dereference (scsi_send_eh_cmnd)
Whenever I plug my USB3 hub into the PC, I encounter this bug (log attached). It stops the PC from booting if the hub is inserted at the time, and crashes USB if I encounter it once the desktop is running.
The line where it crashes is in scsi_error.c at line 782:
struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd);
which expands to:
struct scsi_driver *sdrv *(struct scsi_driver
**)scmd->request->rq_disk->private_data
The issue is that rq_disk is NULL (possibly because it's a USB hub and there isn't necessarily an underlying hard drive?).
If I make it check for rq_disk being null before trying to assign sdrv and set sdrv to null accordingly, and then later in the function I check for sdrv being null before looking at sdrv->eh_action, the error goes away and drives on the hub seem to mount and function OK (mostly anyway).
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[Bug 43085] BUG: unable to handle kernel NULL pointer dereference (in scsi_send_eh_cmnd)
https://bugzilla.kernel.org/show_bug.cgi?id=43085
Alan <[email protected]> changed:
What |Removed |Added
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CC| |[email protected] Component|Other |USB AssignedTo|scsi_drivers-other@kernel-b |[email protected] |ugs.osdl.org | Product|SCSI Drivers |Drivers
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