From: David Miller <davem@davemloft.net>
Date: Sat, 28 Jul 2007 05:58:37 +0000 (-0700)
Subject: Fix procfs compat_ioctl regression
X-Git-Tag: v2.6.23-rc2~173
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=778f3dd5a13c9e1642e0b2efea4b769387a70afa;p=linux-2.6

Fix procfs compat_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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 94e2c1adf1..a5b0dfd89a 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;
 		}