may_follow_link() should use nd->inode

Now that we can get there in RCU mode, we shouldn't play with nd->path.dentry->d_inode - it's not guaranteed to be stable. Use nd->inode instead. Reported-by: Hugh Dickins <[email protected]> Signed-off-by: Al Viro <[email protected]>
pmladek · Aug 5, 2015 · aa65fa3 · aa65fa3
1 parent 97242f9
commit aa65fa3
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/fs/namei.c b/fs/namei.c
@@ -879,7 +879,7 @@ static inline int may_follow_link(struct nameidata *nd)
 		return 0;
 
 	/* Allowed if parent directory not sticky and world-writable. */
-	parent = nd->path.dentry->d_inode;
+	parent = nd->inode;
 	if ((parent->i_mode & (S_ISVTX|S_IWOTH)) != (S_ISVTX|S_IWOTH))
 		return 0;