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Fix race between proc_readdir and remove_proc_entry

Fix the following race:

proc_readdir				remove_proc_entry
============				=================

spin_lock(&proc_subdir_lock);
[choose PDE to start filldir from]
spin_unlock(&proc_subdir_lock);
					spin_lock(&proc_subdir_lock);
					[find PDE]
					[free PDE, refcount is 0]
					spin_unlock(&proc_subdir_lock);
		    /* boom */
if (filldir(dirent, de->name, ...

[de_put on error path --adobriyan]
Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Darrick J. Wong 18 years ago
parent
commit
59cd0cbc75
1 changed files with 9 additions and 2 deletions
  1. 9 2
      fs/proc/generic.c

+ 9 - 2
fs/proc/generic.c

@@ -478,14 +478,21 @@ int proc_readdir(struct file * filp,
 			}
 
 			do {
+				struct proc_dir_entry *next;
+
 				/* filldir passes info to user space */
+				de_get(de);
 				spin_unlock(&proc_subdir_lock);
 				if (filldir(dirent, de->name, de->namelen, filp->f_pos,
-					    de->low_ino, de->mode >> 12) < 0)
+					    de->low_ino, de->mode >> 12) < 0) {
+					de_put(de);
 					goto out;
+				}
 				spin_lock(&proc_subdir_lock);
 				filp->f_pos++;
-				de = de->next;
+				next = de->next;
+				de_put(de);
+				de = next;
 			} while (de);
 			spin_unlock(&proc_subdir_lock);
 	}