From: Kari Argillander kari.argillander@gmail.com

mainline inclusion from mainline-v5.15 commit d4e8e135a9af7d8d939bba1874ab314322fc2dc2 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4G67J?from=project-issue CVE: NA

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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@oracle.com Link: lore.kernel.org/ntfs3/20210825080440.GA17407@kili/

Fixes: 4342306f0f0d ("fs/ntfs3: Add file operations and implementation") Signed-off-by: Kari Argillander kari.argillander@gmail.com Signed-off-by: Konstantin Komarov almaz.alexandrovich@paragon-software.com Signed-off-by: Yin Xiujiang yinxiujiang@kylinos.cn --- 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 89557d60a9b0..f9c9a8c91b46 100644 --- a/fs/ntfs3/file.c +++ b/fs/ntfs3/file.c @@ -1212,8 +1212,9 @@ 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);