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-ot...@kernel-bugs.osdl.org
ReportedBy: yangyeping_...@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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