mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Michael S. Tsirkin](/assets/img/avatar_default.png)
ERROR: "memcpy_fromiovecend" [drivers/vhost/vhost_scsi.ko] undefined!
commit 9f977ef7b6
vhost-scsi: Include prot_bytes into expected data transfer length
in target-pending makes drivers/vhost/scsi.c call memcpy_fromiovecend().
This function is not available when CONFIG_NET is not enabled.
socket.h already includes uio.h, so no callers need updating.
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
108 lines
2.1 KiB
C
108 lines
2.1 KiB
C
#include <linux/uaccess.h>
|
|
#include <linux/export.h>
|
|
#include <linux/uio.h>
|
|
|
|
/*
|
|
* Copy iovec to kernel. Returns -EFAULT on error.
|
|
*
|
|
* Note: this modifies the original iovec.
|
|
*/
|
|
|
|
int memcpy_fromiovec(unsigned char *kdata, struct iovec *iov, int len)
|
|
{
|
|
while (len > 0) {
|
|
if (iov->iov_len) {
|
|
int copy = min_t(unsigned int, len, iov->iov_len);
|
|
if (copy_from_user(kdata, iov->iov_base, copy))
|
|
return -EFAULT;
|
|
len -= copy;
|
|
kdata += copy;
|
|
iov->iov_base += copy;
|
|
iov->iov_len -= copy;
|
|
}
|
|
iov++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(memcpy_fromiovec);
|
|
|
|
/*
|
|
* Copy kernel to iovec. Returns -EFAULT on error.
|
|
*
|
|
* Note: this modifies the original iovec.
|
|
*/
|
|
|
|
int memcpy_toiovec(struct iovec *iov, unsigned char *kdata, int len)
|
|
{
|
|
while (len > 0) {
|
|
if (iov->iov_len) {
|
|
int copy = min_t(unsigned int, iov->iov_len, len);
|
|
if (copy_to_user(iov->iov_base, kdata, copy))
|
|
return -EFAULT;
|
|
kdata += copy;
|
|
len -= copy;
|
|
iov->iov_len -= copy;
|
|
iov->iov_base += copy;
|
|
}
|
|
iov++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(memcpy_toiovec);
|
|
|
|
/*
|
|
* Copy kernel to iovec. Returns -EFAULT on error.
|
|
*/
|
|
|
|
int memcpy_toiovecend(const struct iovec *iov, unsigned char *kdata,
|
|
int offset, int len)
|
|
{
|
|
int copy;
|
|
for (; len > 0; ++iov) {
|
|
/* Skip over the finished iovecs */
|
|
if (unlikely(offset >= iov->iov_len)) {
|
|
offset -= iov->iov_len;
|
|
continue;
|
|
}
|
|
copy = min_t(unsigned int, iov->iov_len - offset, len);
|
|
if (copy_to_user(iov->iov_base + offset, kdata, copy))
|
|
return -EFAULT;
|
|
offset = 0;
|
|
kdata += copy;
|
|
len -= copy;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(memcpy_toiovecend);
|
|
|
|
/*
|
|
* Copy iovec to kernel. Returns -EFAULT on error.
|
|
*/
|
|
|
|
int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov,
|
|
int offset, int len)
|
|
{
|
|
/* Skip over the finished iovecs */
|
|
while (offset >= iov->iov_len) {
|
|
offset -= iov->iov_len;
|
|
iov++;
|
|
}
|
|
|
|
while (len > 0) {
|
|
u8 __user *base = iov->iov_base + offset;
|
|
int copy = min_t(unsigned int, len, iov->iov_len - offset);
|
|
|
|
offset = 0;
|
|
if (copy_from_user(kdata, base, copy))
|
|
return -EFAULT;
|
|
len -= copy;
|
|
kdata += copy;
|
|
iov++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(memcpy_fromiovecend);
|