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carl9170: fix debugfs crashes

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Ben Greear reported:
> I see lots of instability as soon as I load up the carl9710 NIC.
> My application is going to be poking at it's debugfs files...
>
> BUG: KASAN: slab-out-of-bounds in carl9170_debugfs_read+0xd5/0x2a0
> [carl9170] at addr 0xffff8801bc1208b0
> Read of size 8 by task btserver/5888
> =======================================================================
> BUG kmalloc-256 (Tainted: G        W      ): kasan: bad access detected
> -----------------------------------------------------------------------
>
> INFO: Allocated in seq_open+0x50/0x100 age=2690 cpu=2 pid=772
>...

This breakage was caused by the introduction of intermediate
fops in debugfs by commit 9fd4dcece4
("debugfs: prevent access to possibly dead file_operations at file open")

Thankfully, the original/real fops are still available in d_fsdata.

Reported-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Cc: stable <stable@vger.kernel.org> # 4.7+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Lamparter 2016-09-21 18:49:36 +02:00 committed by Greg Kroah-Hartman
parent 9c4a45b17e
commit 6ee6d1cb39
1 changed files with 4 additions and 2 deletions
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6
drivers/net/wireless/ath/carl9170/debug.c
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@ -75,7 +75,8 @@ static ssize_t carl9170_debugfs_read(struct file *file, char __user *userbuf,
if (!ar)
return -ENODEV;
dfops = container_of(file->f_op, struct carl9170_debugfs_fops, fops);
dfops = container_of(debugfs_real_fops(file),
struct carl9170_debugfs_fops, fops);
if (!dfops->read)
return -ENOSYS;
@ -127,7 +128,8 @@ static ssize_t carl9170_debugfs_write(struct file *file,
if (!ar)
return -ENODEV;
dfops = container_of(file->f_op, struct carl9170_debugfs_fops, fops);
dfops = container_of(debugfs_real_fops(file),
struct carl9170_debugfs_fops, fops);
if (!dfops->write)
return -ENOSYS;