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ovl: set lower layer st_dev only if setting lower st_ino

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commit 9f99e50d46 upstream.

For broken hardlinks, we do not return lower st_ino, so we should
also not return lower pseudo st_dev.

Fixes: a0c5ad307a ("ovl: relax same fs constraint for constant st_ino")
Cc: <stable@vger.kernel.org> #v4.15
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Amir Goldstein 2018-04-11 20:09:29 +03:00 committed by Greg Kroah-Hartman
parent 9def916c75
commit c4f45cf301
1 changed files with 2 additions and 5 deletions
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7
fs/overlayfs/inode.c
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@ -110,13 +110,10 @@ int ovl_getattr(const struct path *path, struct kstat *stat,
* that the upper hardlink is not broken.
*/
if (is_dir || lowerstat.nlink == 1 ||
ovl_test_flag(OVL_INDEX, d_inode(dentry)))
ovl_test_flag(OVL_INDEX, d_inode(dentry))) {
stat->ino = lowerstat.ino;
if (samefs)
WARN_ON_ONCE(stat->dev != lowerstat.dev);
else
stat->dev = ovl_get_pseudo_dev(dentry);
}
}
if (samefs) {
/*