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xfs: revert commit 8954c44ff4

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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: 8954c44ff4 ("xfs: use strscpy() to instead of strncpy()")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Darrick J. Wong 2023-02-10 09:06:06 -08:00
parent 2ee8333529
commit dd07bb8b6b
1 changed files with 3 additions and 1 deletions
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4
fs/xfs/xfs_xattr.c
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@ -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;