Use fiemap_prep() to check valid flags. It also shrink request scope
(@len) to what the fs can actually handle.
This address following Smatch static checker warning:
fs/ntfs3/frecord.c:1894 ni_fiemap()
warn: potential integer overflow from user 'vbo + len'
Because fiemap_prep() shrinks @len this cannot happened anymore.
Reported-by Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Link: lore.kernel.org/ntfs3/20210825080440.GA17407@kili/
Fixes: 4342306f0f0d ("fs/ntfs3: Add file operations and implementation")
Signed-off-by: Kari Argillander <kari.argillander@xxxxxxxxx>
---
fs/ntfs3/file.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
index 59344985c2e8..cb736701f2cc 100644
--- a/fs/ntfs3/file.c
+++ b/fs/ntfs3/file.c
@@ -1210,8 +1210,9 @@ int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
int err;
struct ntfs_inode *ni = ntfs_i(inode);
- if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
- return -EOPNOTSUPP;
+ err = fiemap_prep(inode, fieinfo, start, &len, ~FIEMAP_FLAG_XATTR);
+ if (err)
+ return err;
ni_lock(ni);
--
2.30.2
