Revision 0db99e3359234be181590463184b9959059a9ea9 authored by Mike Christie on 26 August 2006, 07:00:22 UTC, committed by James Bottomley on 26 August 2006, 15:03:14 UTC
The callers of scsi_send_eh_cmnd are setting the cmnd buffer, and then scsi_send_eh_cmnd is copying that updated buffer to the old_cmnd variable. Then after the command runs, we end up copying that old_cmnd var which has the new cmnd to the scsi command buffer. When this command gets recent, all types of fun things happen like getting TUR or START_STOP commands with data and scatterlists. This patch made against scsi-rc-fixes, has the callers of scsi_send_eh_cmnd pass in the command so scsi_send_eh_cmnd can do the right thing. This should go into 2.6.18 since this fixes a regression added when we removed some of the scsi_cmnd fields and replaced them with local variables. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
1 parent 15a3758
msgutil.c
/*
* linux/ipc/util.c
* Copyright (C) 1999, 2004 Manfred Spraul
*
* This file is released under GNU General Public Licence version 2 or
* (at your option) any later version.
*
* See the file COPYING for more details.
*/
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/security.h>
#include <linux/slab.h>
#include <linux/ipc.h>
#include <asm/uaccess.h>
#include "util.h"
struct msg_msgseg {
struct msg_msgseg* next;
/* the next part of the message follows immediately */
};
#define DATALEN_MSG (PAGE_SIZE-sizeof(struct msg_msg))
#define DATALEN_SEG (PAGE_SIZE-sizeof(struct msg_msgseg))
struct msg_msg *load_msg(const void __user *src, int len)
{
struct msg_msg *msg;
struct msg_msgseg **pseg;
int err;
int alen;
alen = len;
if (alen > DATALEN_MSG)
alen = DATALEN_MSG;
msg = (struct msg_msg *)kmalloc(sizeof(*msg) + alen, GFP_KERNEL);
if (msg == NULL)
return ERR_PTR(-ENOMEM);
msg->next = NULL;
msg->security = NULL;
if (copy_from_user(msg + 1, src, alen)) {
err = -EFAULT;
goto out_err;
}
len -= alen;
src = ((char __user *)src) + alen;
pseg = &msg->next;
while (len > 0) {
struct msg_msgseg *seg;
alen = len;
if (alen > DATALEN_SEG)
alen = DATALEN_SEG;
seg = (struct msg_msgseg *)kmalloc(sizeof(*seg) + alen,
GFP_KERNEL);
if (seg == NULL) {
err = -ENOMEM;
goto out_err;
}
*pseg = seg;
seg->next = NULL;
if (copy_from_user(seg + 1, src, alen)) {
err = -EFAULT;
goto out_err;
}
pseg = &seg->next;
len -= alen;
src = ((char __user *)src) + alen;
}
err = security_msg_msg_alloc(msg);
if (err)
goto out_err;
return msg;
out_err:
free_msg(msg);
return ERR_PTR(err);
}
int store_msg(void __user *dest, struct msg_msg *msg, int len)
{
int alen;
struct msg_msgseg *seg;
alen = len;
if (alen > DATALEN_MSG)
alen = DATALEN_MSG;
if (copy_to_user(dest, msg + 1, alen))
return -1;
len -= alen;
dest = ((char __user *)dest) + alen;
seg = msg->next;
while (len > 0) {
alen = len;
if (alen > DATALEN_SEG)
alen = DATALEN_SEG;
if (copy_to_user(dest, seg + 1, alen))
return -1;
len -= alen;
dest = ((char __user *)dest) + alen;
seg = seg->next;
}
return 0;
}
void free_msg(struct msg_msg *msg)
{
struct msg_msgseg *seg;
security_msg_msg_free(msg);
seg = msg->next;
kfree(msg);
while (seg != NULL) {
struct msg_msgseg *tmp = seg->next;
kfree(seg);
seg = tmp;
}
}
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