If we rmdir a directory which is a hard link to '.', we will deadlock
trying to grab the directory's i_mutex. Check for this condition and
return EINVAL, which is what we return if the user attempts to rmdir
"/foo/bar/."
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
---
fs/namei.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/fs/namei.c b/fs/namei.c
index 0062dd1..081f872 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2774,6 +2774,17 @@ static long do_rmdir(int dfd, const char __user *pathname)
error = -ENOENT;
goto exit3;
}
+ if (nd.path.dentry->d_inode == dentry->d_inode) {
+ /*
+ * Corrupt file system where there is a symlink to
+ * '.'; treat it as if we are trying to rmdir '.'
+ *
+ * XXX Should we call into the low-level file system
+ * to request that the file system be marked corrupt?
+ */
+ error = -EINVAL;
+ goto exit3;
+ }
error = mnt_want_write(nd.path.mnt);
if (error)
goto exit3;
--
1.7.10.2.552.gaa3bb87
--
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