From: Jason Baron <jbaron@redhat.com>
Date: Thu, 16 Oct 2008 05:01:52 +0000 (-0700)
Subject: exec.c, compat.c: fix count(), compat_count() bounds checking
X-Git-Tag: v2.6.28-rc1~522
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=362e6663ef2369d77251496d865ad02a2376f962;p=linux-2.6-omap-h63xx.git

exec.c, compat.c: fix count(), compat_count() bounds checking

With MAX_ARG_STRINGS set to 0x7FFFFFFF, and being passed to 'count()' and
compat_count(), it would appear that the current max bounds check of
fs/exec.c:394:

	if(++i > max)
		return -E2BIG;

would never trigger. Since 'i' is of type int, so values would wrap and the
function would continue looping.

Simple fix seems to be chaning ++i to i++ and checking for '>='.

Signed-off-by: Jason Baron <jbaron@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Ollie Wild" <aaw@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/compat.c b/fs/compat.c
index 075d0509970..aae13d31612 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1239,7 +1239,7 @@ static int compat_count(compat_uptr_t __user *argv, int max)
 			if (!p)
 				break;
 			argv++;
-			if(++i > max)
+			if (i++ >= max)
 				return -E2BIG;
 		}
 	}
diff --git a/fs/exec.c b/fs/exec.c
index cecee501ce7..7b5ed50eade 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -391,7 +391,7 @@ static int count(char __user * __user * argv, int max)
 			if (!p)
 				break;
 			argv++;
-			if(++i > max)
+			if (i++ >= max)
 				return -E2BIG;
 			cond_resched();
 		}