[PATCH] iov_iter: fix the uaccess area in copy_compat_iovec_from_user

[Christoph Hellwig]

sizeof needs to be called on the compat pointer, not the native one.

Fixes: 89cd35c58bc2 ("iov_iter: transparently handle compat iovecs in 
import_iovec")
Reported-by: David Laight <david.lai...@aculab.com>
Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 lib/iov_iter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 1635111c5bd2af..586215aa0f15ce 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1658,7 +1658,7 @@ static int copy_compat_iovec_from_user(struct iovec *iov,
                (const struct compat_iovec __user *)uvec;
        int ret = -EFAULT, i;
 
-       if (!user_access_begin(uvec, nr_segs * sizeof(*uvec)))
+       if (!user_access_begin(uvec, nr_segs * sizeof(*uiov)))
                return -EFAULT;
 
        for (i = 0; i < nr_segs; i++) {
-- 
2.29.2