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authorAl Viro <viro@zeniv.linux.org.uk>2015-03-21 20:25:30 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2015-04-11 22:27:14 -0400
commitfdc81f45e9f57858da6351836507fbcf1b7583ee (patch)
tree3f7e4ec5af122eccf85ab526ad01e8df01848f2b
parent451a2886b6bf90e2fb378f7c46c655450fb96e81 (diff)
sg_start_req(): use import_iovec()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--drivers/scsi/sg.c16
1 files changed, 5 insertions, 11 deletions
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index b5a4db883223..9d7b7db75e4b 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1744,21 +1744,15 @@ sg_start_req(Sg_request *srp, unsigned char *cmd)
md->from_user = 0;
}
- if (unlikely(iov_count > MAX_UIOVEC))
- return -EINVAL;
-
if (iov_count) {
- int size = sizeof(struct iovec) * iov_count;
- struct iovec *iov;
+ struct iovec *iov = NULL;
struct iov_iter i;
- iov = memdup_user(hp->dxferp, size);
- if (IS_ERR(iov))
- return PTR_ERR(iov);
+ res = import_iovec(rw, hp->dxferp, iov_count, 0, &iov, &i);
+ if (res < 0)
+ return res;
- iov_iter_init(&i, rw, iov, iov_count,
- min_t(size_t, hp->dxfer_len,
- iov_length(iov, iov_count)));
+ iov_iter_truncate(&i, hp->dxfer_len);
res = blk_rq_map_user_iov(q, rq, md, &i, GFP_ATOMIC);
kfree(iov);