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authorSalyzyn, Mark <mark_salyzyn@adaptec.com>2007-03-21 13:22:56 -0400
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2007-03-21 13:45:15 -0400
commit20235f35221472f1a127a5d5414f11091eb0a845 (patch)
tree4b827f2e8a8056974fe6cae63cf06b8c31aa1780 /drivers/scsi/aacraid
parent0272bf7271eb6895b081c3df34c3ebe50cb769b7 (diff)
[SCSI] aacraid: check buffer address in aac_internal_transfer
Captured a panic on an older kernel where an application issuing commands via sg was sending requests that lacked a request_buffer, thus the buffer pointer used in aac_internal_transer was NULL. The application was fixed closing the issue, but felt it was advised to immunize the driver against the eventuality. Signed-off-by: Mark Salyzyn <aacraid@adaptec.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/aacraid')
-rw-r--r--drivers/scsi/aacraid/aachba.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index 0c4e27eb6520..f9deab686dc4 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -350,8 +350,9 @@ static void aac_internal_transfer(struct scsi_cmnd *scsicmd, void *data, unsigne
350 buf = scsicmd->request_buffer; 350 buf = scsicmd->request_buffer;
351 transfer_len = min(scsicmd->request_bufflen, len + offset); 351 transfer_len = min(scsicmd->request_bufflen, len + offset);
352 } 352 }
353 353 transfer_len -= offset;
354 memcpy(buf + offset, data, transfer_len - offset); 354 if (buf && transfer_len)
355 memcpy(buf + offset, data, transfer_len);
355 356
356 if (scsicmd->use_sg) 357 if (scsicmd->use_sg)
357 kunmap_atomic(buf - sg->offset, KM_IRQ0); 358 kunmap_atomic(buf - sg->offset, KM_IRQ0);