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fs/ntfs3: Fix integer overflow in ni_fiemap with fiemap_prep()

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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: 4342306f0f ("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>
This commit is contained in:
Kari Argillander 2021-08-25 21:24:35 +03:00 committed by Konstantin Komarov
parent d3624466b5
commit d4e8e135a9
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1 changed files with 3 additions and 2 deletions
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5
fs/ntfs3/file.c
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@ -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);