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| author | Darrick J. Wong <djwong@kernel.org> | 2023-02-10 20:06:06 +0300 |
|---|---|---|
| committer | Darrick J. Wong <djwong@kernel.org> | 2023-02-10 20:06:06 +0300 |
| commit | dd07bb8b6baf2389caff221f043d9188ce6bab8c (patch) | |
| tree | fd1206f2a1e7849ea19b68eef376a2f03c71d504 /fs | |
| parent | 2ee8333529857a702475ce36d3af3ecbbcf5af5a (diff) | |
| download | linux-dd07bb8b6baf2389caff221f043d9188ce6bab8c.tar.xz | |
xfs: revert commit 8954c44ff477
The name passed into __xfs_xattr_put_listent is exactly namelen bytes
long and not null-terminated. Passing namelen+1 to the strscpy function
strscpy(offset, (char *)name, namelen + 1);
is therefore wrong. Go back to the old code, which works fine because
strncpy won't find a null in @name and stops after namelen bytes. It
really could be a memcpy call, but it worked for years.
Reported-by: syzbot+898115bc6d7140437215@syzkaller.appspotmail.com
Fixes: 8954c44ff477 ("xfs: use strscpy() to instead of strncpy()")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/xfs/xfs_xattr.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c index 913c1794bc2f..10aa1fd39d2b 100644 --- a/fs/xfs/xfs_xattr.c +++ b/fs/xfs/xfs_xattr.c @@ -212,7 +212,9 @@ __xfs_xattr_put_listent( offset = context->buffer + context->count; memcpy(offset, prefix, prefix_len); offset += prefix_len; - strscpy(offset, (char *)name, namelen + 1); /* real name */ + strncpy(offset, (char *)name, namelen); /* real name */ + offset += namelen; + *offset = '\0'; compute_size: context->count += prefix_len + namelen + 1; |