This is a note to let you know that I've just added the patch titled sysfs: handle failure path correctly for readdir() to the 3.8-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: sysfs-handle-failure-path-correctly-for-readdir.patch and it can be found in the queue-3.8 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From e5110f411d2ee35bf8d202ccca2e89c633060dca Mon Sep 17 00:00:00 2001 From: Ming Lei <ming.lei@xxxxxxxxxxxxx> Date: Wed, 20 Mar 2013 23:25:25 +0800 Subject: sysfs: handle failure path correctly for readdir() From: Ming Lei <ming.lei@xxxxxxxxxxxxx> commit e5110f411d2ee35bf8d202ccca2e89c633060dca upstream. In case of 'if (filp->f_pos == 0 or 1)' of sysfs_readdir(), the failure from filldir() isn't handled, and the reference counter of the sysfs_dirent object pointed by filp->private_data will be released without clearing filp->private_data, so use after free bug will be triggered later. This patch returns immeadiately under the situation for fixing the bug, and it is reasonable to return from readdir() when filldir() fails. Reported-by: Dave Jones <davej@xxxxxxxxxx> Tested-by: Sasha Levin <levinsasha928@xxxxxxxxx> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/sysfs/dir.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -1020,6 +1020,8 @@ static int sysfs_readdir(struct file * f ino = parent_sd->s_ino; if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) == 0) filp->f_pos++; + else + return 0; } if (filp->f_pos == 1) { if (parent_sd->s_parent) @@ -1028,6 +1030,8 @@ static int sysfs_readdir(struct file * f ino = parent_sd->s_ino; if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) == 0) filp->f_pos++; + else + return 0; } mutex_lock(&sysfs_mutex); for (pos = sysfs_dir_pos(ns, parent_sd, filp->f_pos, pos); Patches currently in stable-queue which might be from ming.lei@xxxxxxxxxxxxx are queue-3.8/bluetooth-add-support-for-dell.patch queue-3.8/sysfs-handle-failure-path-correctly-for-readdir.patch queue-3.8/bluetooth-add-support-for-dell_2.patch queue-3.8/sysfs-fix-race-between-readdir-and-lseek.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html