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b43: fix debugfs crash

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This patch fixes a crash that happens because b43's
debugfs code expects file->f_op to be a pointer to
its own b43_debugfs_fops struct. This is no longer
the case since commit 9fd4dcece4
("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>
Cc: stable <stable@vger.kernel.org> # 4.7+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Lamparter 2016-09-17 21:43:03 +02:00 committed by Greg Kroah-Hartman
parent 86f0e06767
commit 51b275a6fe
1 changed files with 4 additions and 2 deletions
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6
drivers/net/wireless/broadcom/b43/debugfs.c
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@ -524,7 +524,8 @@ static ssize_t b43_debugfs_read(struct file *file, char __user *userbuf,
goto out_unlock;
}
dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
dfops = container_of(debugfs_real_fops(file),
struct b43_debugfs_fops, fops);
if (!dfops->read) {
err = -ENOSYS;
goto out_unlock;
@ -585,7 +586,8 @@ static ssize_t b43_debugfs_write(struct file *file,
goto out_unlock;
}
dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
dfops = container_of(debugfs_real_fops(file),
struct b43_debugfs_fops, fops);
if (!dfops->write) {
err = -ENOSYS;
goto out_unlock;