f2fs: fix race conditions in ->d_compare() and ->d_hash()

Since ->d_compare() and ->d_hash() can be called in RCU-walk mode,
->d_parent and ->d_inode can be concurrently modified, and in
particular, ->d_inode may be changed to NULL.  For f2fs_d_hash() this
resulted in a reproducible NULL dereference if a lookup is done in a
directory being deleted, e.g. with:

	int main()
	{
		if (fork()) {
			for (;;) {
				mkdir("subdir", 0700);
				rmdir("subdir");
			}
		} else {
			for (;;)
				access("subdir/file", 0);
		}
	}

... or by running the 't_encrypted_d_revalidate' program from xfstests.
Both repros work in any directory on a filesystem with the encoding
feature, even if the directory doesn't actually have the casefold flag.

I couldn't reproduce a crash in f2fs_d_compare(), but it appears that a
similar crash is possible there.

Fix these bugs by reading ->d_parent and ->d_inode using READ_ONCE() and
falling back to the case sensitive behavior if the inode is NULL.

Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Fixes: 2c2eb7a300cd ("f2fs: Support case-insensitive file name lookups")
Cc: <stable@vger.kernel.org> # v5.4+
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index aea9e28..d7c9a2c 100644 (file)
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -1083,24 +1083,27 @@ static int f2fs_d_compare(const struct dentry *dentry, unsigned int len,
                          const char *str, const struct qstr *name)
 {
        struct qstr qstr = {.name = str, .len = len };
+       const struct dentry *parent = READ_ONCE(dentry->d_parent);
+       const struct inode *inode = READ_ONCE(parent->d_inode);
 
-       if (!IS_CASEFOLDED(dentry->d_parent->d_inode)) {
+       if (!inode || !IS_CASEFOLDED(inode)) {
                if (len != name->len)
                        return -1;
                return memcmp(str, name->name, len);
        }
 
-       return f2fs_ci_compare(dentry->d_parent->d_inode, name, &qstr, false);
+       return f2fs_ci_compare(inode, name, &qstr, false);
 }
 
 static int f2fs_d_hash(const struct dentry *dentry, struct qstr *str)
 {
        struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
        const struct unicode_map *um = sbi->s_encoding;
+       const struct inode *inode = READ_ONCE(dentry->d_inode);
        unsigned char *norm;
        int len, ret = 0;
 
-       if (!IS_CASEFOLDED(dentry->d_inode))
+       if (!inode || !IS_CASEFOLDED(inode))
                return 0;
 
        norm = f2fs_kmalloc(sbi, PATH_MAX, GFP_ATOMIC);