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Subject[PATCH]: Fix procfs compat_ioctl regression.
From

Alexey reviewed the patch and is fine with this fix.

Please apply, thanks!

[PROCFS]: Fix ioctl regression.

It is important to only provide the compat_ioctl method
if the downstream de->proc_fops does too, otherwise this
utterly confuses the logic in fs/compat_ioctl.c and we
end up doing the wrong thing.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Alexey Dobriyan <adobriyan@sw.ru>

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 94e2c1a..a5b0dfd 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -386,6 +386,19 @@ static const struct file_operations proc_reg_file_ops = {
.release = proc_reg_release,
};

+#ifdef CONFIG_COMPAT
+static const struct file_operations proc_reg_file_ops_no_compat = {
+ .llseek = proc_reg_llseek,
+ .read = proc_reg_read,
+ .write = proc_reg_write,
+ .poll = proc_reg_poll,
+ .unlocked_ioctl = proc_reg_unlocked_ioctl,
+ .mmap = proc_reg_mmap,
+ .open = proc_reg_open,
+ .release = proc_reg_release,
+};
+#endif
+
struct inode *proc_get_inode(struct super_block *sb, unsigned int ino,
struct proc_dir_entry *de)
{
@@ -413,8 +426,15 @@ struct inode *proc_get_inode(struct super_block *sb, unsigned int ino,
if (de->proc_iops)
inode->i_op = de->proc_iops;
if (de->proc_fops) {
- if (S_ISREG(inode->i_mode))
- inode->i_fop = &proc_reg_file_ops;
+ if (S_ISREG(inode->i_mode)) {
+#ifdef CONFIG_COMPAT
+ if (!de->proc_fops->compat_ioctl)
+ inode->i_fop =
+ &proc_reg_file_ops_no_compat;
+ else
+#endif
+ inode->i_fop = &proc_reg_file_ops;
+ }
else
inode->i_fop = de->proc_fops;
}
-
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