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block: Use rw_copy_check_uvector()

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No need for silly open coding - and struct sg_iovec has exactly the same
layout as struct iovec...

Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kent Overstreet 2013-08-07 14:20:17 -07:00 committed by Jens Axboe
parent 23779fbc99
commit e0ce0eacb3
1 changed files with 10 additions and 29 deletions
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39
block/scsi_ioctl.c
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@ -286,7 +286,8 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
struct sg_io_hdr *hdr, fmode_t mode)
{
unsigned long start_time;
int writing = 0, ret = 0;
ssize_t ret = 0;
int writing = 0;
struct request *rq;
char sense[SCSI_SENSE_BUFFERSIZE];
struct bio *bio;
@ -321,37 +322,16 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
}
if (hdr->iovec_count) {
const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
size_t iov_data_len;
struct sg_iovec *sg_iov;
struct iovec *iov;
int i;
sg_iov = kmalloc(size, GFP_KERNEL);
if (!sg_iov) {
ret = -ENOMEM;
ret = rw_copy_check_uvector(-1, hdr->dxferp, hdr->iovec_count,
0, NULL, &iov);
if (ret < 0)
goto out;
}
if (copy_from_user(sg_iov, hdr->dxferp, size)) {
kfree(sg_iov);
ret = -EFAULT;
goto out;
}
/*
* Sum up the vecs, making sure they don't overflow
*/
iov = (struct iovec *) sg_iov;
iov_data_len = 0;
for (i = 0; i < hdr->iovec_count; i++) {
if (iov_data_len + iov[i].iov_len < iov_data_len) {
kfree(sg_iov);
ret = -EINVAL;
goto out;
}
iov_data_len += iov[i].iov_len;
}
iov_data_len = ret;
ret = 0;
/* SG_IO howto says that the shorter of the two wins */
if (hdr->dxfer_len < iov_data_len) {
@ -361,9 +341,10 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
iov_data_len = hdr->dxfer_len;
}
ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
ret = blk_rq_map_user_iov(q, rq, NULL, (struct sg_iovec *) iov,
hdr->iovec_count,
iov_data_len, GFP_KERNEL);
kfree(sg_iov);
kfree(iov);
} else if (hdr->dxfer_len)
ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
GFP_KERNEL);