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New: Unsafe dereference of pointer after allocing memory

Bug 49241 New [email protected] 1 participant 5 messages Oct 22, 2012 – Dec 27, 2013 SCSI

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https://bugzilla.kernel.org/show_bug.cgi?id=49241

Summary: Unsafe dereference of pointer after allocing memory
Product: SCSI Drivers
Version: 2.5
Kernel Version: 3.0.47
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Regression: No

Vulnerability kind: Null-pointer dereference
The file path containing this vulnerability: drivers/scsi/mac_scsi.c Line number: 290
Severity: medium
Code fragment (from line 270 to line 290):

instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));

#if NDEBUG
    default_instance = instance;

#endif

    if (macintosh_config->ident == MAC_MODEL_IIFX) {
        mac_scsi_regp  = via1+0x8000;
        mac_scsi_drq   = via1+0xE000;
        mac_scsi_nodrq = via1+0xC000;
        /* The IIFX should be able to do true DMA, but pseudo-dma doesn't work
*/
        flags = FLAG_NO_PSEUDO_DMA;
    } else {
        mac_scsi_regp  = via1+0x10000;
        mac_scsi_drq   = via1+0x6000;
        mac_scsi_nodrq = via1+0x12000;
    }

    if (! setup_use_pdma)
        flags = FLAG_NO_PSEUDO_DMA;

    instance->io_port = (unsigned long) mac_scsi_regp;

Description: The variable "instance" is defined at line 270 via function "scsi_register" but is not sanity-checked.Then it is dereferenced at line 290.

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author
#1 lore raw

PATCH 1/1 Unsafe dereference of pointer after allocing memory

https://bugzilla.kernel.org/show_bug.cgi?id=49241

Alan <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

                 CC|                            |[email protected]
            Summary|Unsafe dereference of       |[PATCH]Unsafe dereference
                   |pointer after allocing      |of pointer after allocing
                   |memory                      |memory
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author
#2 lore raw

PATCH 1/1 Unsafe dereference of pointer after allocing memory

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=49241

Alan <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

           Assignee|scsi_drivers-other@kernel-b |[email protected]
                   |ugs.osdl.org                |
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