From: Patrick McHardy <kaber@trash.net>
Date: Thu, 4 May 2006 06:20:27 +0000 (-0700)
Subject: [NETFILTER]: x_tables: don't use __copy_{from,to}_user on unchecked memory in compat... 
X-Git-Tag: firefly_0821_release~35869^2~11
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7800007c1e2d42cd4120b87b0ba3f3480f17f30a;p=firefly-linux-kernel-4.4.55.git

[NETFILTER]: x_tables: don't use __copy_{from,to}_user on unchecked memory in compat layer

Noticed by Linus Torvalds <torvalds@osdl.org>

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 6d1c11563943..cee3397ec277 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -1441,7 +1441,7 @@ static int compat_copy_entry_to_user(struct ipt_entry *e,
 	ret = -EFAULT;
 	origsize = *size;
 	ce = (struct compat_ipt_entry __user *)*dstptr;
-	if (__copy_to_user(ce, e, sizeof(struct ipt_entry)))
+	if (copy_to_user(ce, e, sizeof(struct ipt_entry)))
 		goto out;
 
 	*dstptr += sizeof(struct compat_ipt_entry);
@@ -1459,9 +1459,9 @@ static int compat_copy_entry_to_user(struct ipt_entry *e,
 		goto out;
 	ret = -EFAULT;
 	next_offset = e->next_offset - (origsize - *size);
-	if (__put_user(target_offset, &ce->target_offset))
+	if (put_user(target_offset, &ce->target_offset))
 		goto out;
-	if (__put_user(next_offset, &ce->next_offset))
+	if (put_user(next_offset, &ce->next_offset))
 		goto out;
 	return 0;
 out:
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 17abf60f9570..99293c63ff73 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -289,7 +289,7 @@ int xt_compat_match(void *match, void **dstptr, int *size, int convert)
 		case COMPAT_TO_USER:
 			pm = (struct xt_entry_match *)match;
 			msize = pm->u.user.match_size;
-			if (__copy_to_user(*dstptr, pm, msize)) {
+			if (copy_to_user(*dstptr, pm, msize)) {
 				ret = -EFAULT;
 				break;
 			}
@@ -366,7 +366,7 @@ int xt_compat_target(void *target, void **dstptr, int *size, int convert)
 		case COMPAT_TO_USER:
 			pt = (struct xt_entry_target *)target;
 			tsize = pt->u.user.target_size;
-			if (__copy_to_user(*dstptr, pt, tsize)) {
+			if (copy_to_user(*dstptr, pt, tsize)) {
 				ret = -EFAULT;
 				break;
 			}