[PATCH] exfat: fix range validation error in alloc and free cluster

["hyeongseok.kim" <hyeongseok@gmail.com>]

There is check error in range condition that can never be entered
even with invalid input.
Replace incorrent checking code with already existing valid checker.

Signed-off-by: hyeongseok.kim <hyeongseok@gmail.com>
---
 fs/exfat/fatent.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/exfat/fatent.c b/fs/exfat/fatent.c
index 267e5e0..4e5c5c9 100644
--- a/fs/exfat/fatent.c
+++ b/fs/exfat/fatent.c
@@ -169,7 +169,7 @@ int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain)
 		return 0;
 
 	/* check cluster validation */
-	if (p_chain->dir < 2 && p_chain->dir >= sbi->num_clusters) {
+	if (!is_valid_cluster(sbi, p_chain->dir)) {
 		exfat_err(sb, "invalid start cluster (%u)", p_chain->dir);
 		return -EIO;
 	}
@@ -346,7 +346,7 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
 	}
 
 	/* check cluster validation */
-	if (hint_clu < EXFAT_FIRST_CLUSTER && hint_clu >= sbi->num_clusters) {
+	if (!is_valid_cluster(sbi, hint_clu)) {
 		exfat_err(sb, "hint_cluster is invalid (%u)",
 			hint_clu);
 		hint_clu = EXFAT_FIRST_CLUSTER;
-- 
2.7.4