[PATCH] fs/ntfs3: Don't clear upper bits accidentally in log_replay()

Dan Carpenter
2022-05-09T09:34:22Z

The "vcn" variable is a 64 bit. The "log->clst_per_page" variable is a
u32. This means that the mask accidentally clears out the high 32 bits
when it was only supposed to clear some low bits. Fix this by adding a
cast to u64.

Fixes: b46acd6a6a62 ("fs/ntfs3: Add NTFS journal")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
Why am I getting new Smatch warnings in old ntfs3 code? It is a mystery.

fs/ntfs3/fslog.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ntfs3/fslog.c b/fs/ntfs3/fslog.c
index 915f42cf07bc..0da339fda2f4 100644
--- a/fs/ntfs3/fslog.c
+++ b/fs/ntfs3/fslog.c
@@ -5057,7 +5057,7 @@ int log_replay(struct ntfs_inode *ni, bool *initialized)
goto add_allocated_vcns;

vcn = le64_to_cpu(lrh->target_vcn);
- vcn &= ~(log->clst_per_page - 1);
+ vcn &= ~(u64)(log->clst_per_page - 1);

add_allocated_vcns:
for (i = 0, vcn = le64_to_cpu(lrh->target_vcn),
--
2.35.1