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[SCSI] hpsa: defend against zero sized buffers in passthru ioctls

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Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Stephen M. Cameron 2011-01-06 14:47:48 -06:00 committed by James Bottomley
parent 5fd1062fdf
commit b03a7771c8
1 changed files with 16 additions and 20 deletions
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36
drivers/scsi/hpsa.c
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@ -2433,15 +2433,17 @@ static int hpsa_passthru_ioctl(struct ctlr_info *h, void __user *argp)
buff = kmalloc(iocommand.buf_size, GFP_KERNEL);
if (buff == NULL)
return -EFAULT;
}
if (iocommand.Request.Type.Direction == XFER_WRITE) {
/* Copy the data into the buffer we created */
if (copy_from_user(buff, iocommand.buf, iocommand.buf_size)) {
kfree(buff);
return -EFAULT;
if (iocommand.Request.Type.Direction == XFER_WRITE) {
/* Copy the data into the buffer we created */
if (copy_from_user(buff, iocommand.buf,
iocommand.buf_size)) {
kfree(buff);
return -EFAULT;
}
} else {
memset(buff, 0, iocommand.buf_size);
}
} else
memset(buff, 0, iocommand.buf_size);
}
c = cmd_special_alloc(h);
if (c == NULL) {
kfree(buff);
@ -2487,8 +2489,8 @@ static int hpsa_passthru_ioctl(struct ctlr_info *h, void __user *argp)
cmd_special_free(h, c);
return -EFAULT;
}
if (iocommand.Request.Type.Direction == XFER_READ) {
if (iocommand.Request.Type.Direction == XFER_READ &&
iocommand.buf_size > 0) {
/* Copy the data out of the buffer we created */
if (copy_to_user(iocommand.buf, buff, iocommand.buf_size)) {
kfree(buff);
@ -2581,14 +2583,7 @@ static int hpsa_big_passthru_ioctl(struct ctlr_info *h, void __user *argp)
}
c->cmd_type = CMD_IOCTL_PEND;
c->Header.ReplyQueue = 0;
if (ioc->buf_size > 0) {
c->Header.SGList = sg_used;
c->Header.SGTotal = sg_used;
} else {
c->Header.SGList = 0;
c->Header.SGTotal = 0;
}
c->Header.SGList = c->Header.SGTotal = sg_used;
memcpy(&c->Header.LUN, &ioc->LUN_info, sizeof(c->Header.LUN));
c->Header.Tag.lower = c->busaddr;
memcpy(&c->Request, &ioc->Request, sizeof(c->Request));
@ -2605,7 +2600,8 @@ static int hpsa_big_passthru_ioctl(struct ctlr_info *h, void __user *argp)
}
}
hpsa_scsi_do_simple_cmd_core(h, c);
hpsa_pci_unmap(h->pdev, c, sg_used, PCI_DMA_BIDIRECTIONAL);
if (sg_used)
hpsa_pci_unmap(h->pdev, c, sg_used, PCI_DMA_BIDIRECTIONAL);
check_ioctl_unit_attention(h, c);
/* Copy the error information out */
memcpy(&ioc->error_info, c->err_info, sizeof(ioc->error_info));
@ -2614,7 +2610,7 @@ static int hpsa_big_passthru_ioctl(struct ctlr_info *h, void __user *argp)
status = -EFAULT;
goto cleanup1;
}
if (ioc->Request.Type.Direction == XFER_READ) {
if (ioc->Request.Type.Direction == XFER_READ && ioc->buf_size > 0) {
/* Copy the data out of the buffer we created */
BYTE __user *ptr = ioc->buf;
for (i = 0; i < sg_used; i++) {