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[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>
This commit is contained in:
Salyzyn, Mark 2007-03-21 13:22:56 -04:00 committed by James Bottomley
parent 0272bf7271
commit 20235f3522
1 changed files with 3 additions and 2 deletions
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5
drivers/scsi/aacraid/aachba.c
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@ -350,8 +350,9 @@ static void aac_internal_transfer(struct scsi_cmnd *scsicmd, void *data, unsigne
buf = scsicmd->request_buffer;
transfer_len = min(scsicmd->request_bufflen, len + offset);
}
memcpy(buf + offset, data, transfer_len - offset);
transfer_len -= offset;
if (buf && transfer_len)
memcpy(buf + offset, data, transfer_len);
if (scsicmd->use_sg)
kunmap_atomic(buf - sg->offset, KM_IRQ0);