iov_iter: fix the uaccess area in copy_compat_iovec_from_user

sizeof needs to be called on the compat pointer, not the native one. Fixes: 89cd35c ("iov_iter: transparently handle compat iovecs in import_iovec") Reported-by: David Laight <[email protected]> Signed-off-by: Christoph Hellwig <[email protected]> Signed-off-by: Al Viro <[email protected]>
ashr · Jan 16, 2021 · a959a97 · a959a97
1 parent a0a6df9
commit a959a97
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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(uiov, nr_segs * sizeof(*uiov)))
 		return -EFAULT;
 
 	for (i = 0; i < nr_segs; i++) {