This is a note to let you know that I've just added the patch titled
x86-64: Fix the failure case in copy_user_handle_tail()
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-64-fix-the-failure-case-in-copy_user_handle_tail.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 66db3feb486c01349f767b98ebb10b0c3d2d021b Mon Sep 17 00:00:00 2001
From: CQ Tang <[email protected]>
Date: Mon, 18 Mar 2013 11:02:21 -0400
Subject: x86-64: Fix the failure case in copy_user_handle_tail()
From: CQ Tang <[email protected]>
commit 66db3feb486c01349f767b98ebb10b0c3d2d021b upstream.
The increment of "to" in copy_user_handle_tail() will have incremented
before a failure has been noted. This causes us to skip a byte in the
failure case.
Only do the increment when assured there is no failure.
Signed-off-by: CQ Tang <[email protected]>
Link:
http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mike Marciniszyn <[email protected]>
Signed-off-by: H. Peter Anvin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/lib/usercopy_64.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/x86/lib/usercopy_64.c
+++ b/arch/x86/lib/usercopy_64.c
@@ -169,10 +169,10 @@ copy_user_handle_tail(char *to, char *fr
char c;
unsigned zero_len;
- for (; len; --len) {
+ for (; len; --len, to++) {
if (__get_user_nocheck(c, from++, sizeof(char)))
break;
- if (__put_user_nocheck(c, to++, sizeof(char)))
+ if (__put_user_nocheck(c, to, sizeof(char)))
break;
}
Patches currently in stable-queue which might be from [email protected] are
queue-3.0/x86-64-fix-the-failure-case-in-copy_user_handle_tail.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
