[Bug 49241] New: Unsafe dereference of pointer after allocing memory

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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: scsi_drivers-other@kernel-bugs.osdl.org
        ReportedBy: yangyeping_666@hotmail.com
                CC: linux-scsi@vger.kernel.org
        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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