Patch "b43legacy: fix debugfs crash" has been added to the 4.7-stable tree

Patch "b43legacy: fix debugfs crash" has been added to the 4.7-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    b43legacy: fix debugfs crash

to the 4.7-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:
     b43legacy-fix-debugfs-crash.patch
and it can be found in the queue-4.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 9c4a45b17e094a090e96beb1138e34c2a10c6b8c Mon Sep 17 00:00:00 2001
From: Christian Lamparter <chunkeey@googlemail.com>
Date: Sat, 17 Sep 2016 21:43:04 +0200
Subject: b43legacy: fix debugfs crash

From: Christian Lamparter <chunkeey@googlemail.com>

commit 9c4a45b17e094a090e96beb1138e34c2a10c6b8c upstream.

This patch fixes a crash that happens because b43legacy's
debugfs code expects file->f_op to be a pointer to its own
b43legacy_debugfs_fops struct. This is no longer the case
since commit 9fd4dcece43a
("debugfs: prevent access to possibly dead file_operations at file open")

Reviewed-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/net/wireless/broadcom/b43legacy/debugfs.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/broadcom/b43legacy/debugfs.c
+++ b/drivers/net/wireless/broadcom/b43legacy/debugfs.c
@@ -221,7 +221,8 @@ static ssize_t b43legacy_debugfs_read(st
 		goto out_unlock;
 	}
 
-	dfops = container_of(file->f_op, struct b43legacy_debugfs_fops, fops);
+	dfops = container_of(debugfs_real_fops(file),
+			     struct b43legacy_debugfs_fops, fops);
 	if (!dfops->read) {
 		err = -ENOSYS;
 		goto out_unlock;
@@ -287,7 +288,8 @@ static ssize_t b43legacy_debugfs_write(s
 		goto out_unlock;
 	}
 
-	dfops = container_of(file->f_op, struct b43legacy_debugfs_fops, fops);
+	dfops = container_of(debugfs_real_fops(file),
+			     struct b43legacy_debugfs_fops, fops);
 	if (!dfops->write) {
 		err = -ENOSYS;
 		goto out_unlock;


Patches currently in stable-queue which might be from chunkeey@googlemail.com are

queue-4.7/b43-fix-debugfs-crash.patch
queue-4.7/carl9170-fix-debugfs-crashes.patch
queue-4.7/b43legacy-fix-debugfs-crash.patch
queue-4.7/debugfs-introduce-a-public-file_operations-accessor.patch