* Patch "zram: fix operator precedence to get offset" has been added to the 4.4-stable tree
@ 2017-04-18 12:49 gregkh
2017-04-19 0:58 ` Minchan Kim
0 siblings, 1 reply; 2+ messages in thread
From: gregkh @ 2017-04-18 12:49 UTC (permalink / raw)
To: minchan, akpm, gregkh, sergey.senozhatsky, torvalds
Cc: stable, stable-commits
This is a note to let you know that I've just added the patch titled
zram: fix operator precedence to get offset
to the 4.4-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:
zram-fix-operator-precedence-to-get-offset.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 4ca82dabc9fbf7bc5322aa54d802cb3cb7b125c5 Mon Sep 17 00:00:00 2001
From: Minchan Kim <minchan@kernel.org>
Date: Thu, 13 Apr 2017 14:56:35 -0700
Subject: zram: fix operator precedence to get offset
From: Minchan Kim <minchan@kernel.org>
commit 4ca82dabc9fbf7bc5322aa54d802cb3cb7b125c5 upstream.
In zram_rw_page, the logic to get offset is wrong by operator precedence
(i.e., "<<" is higher than "&"). With wrong offset, zram can corrupt
the user's data. This patch fixes it.
Fixes: 8c7f01025 ("zram: implement rw_page operation of zram")
Link: http://lkml.kernel.org/r/1492042622-12074-1-git-send-email-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/block/zram/zram_drv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -953,7 +953,7 @@ static int zram_rw_page(struct block_dev
}
index = sector >> SECTORS_PER_PAGE_SHIFT;
- offset = sector & (SECTORS_PER_PAGE - 1) << SECTOR_SHIFT;
+ offset = (sector & (SECTORS_PER_PAGE - 1)) << SECTOR_SHIFT;
bv.bv_page = page;
bv.bv_len = PAGE_SIZE;
Patches currently in stable-queue which might be from minchan@kernel.org are
queue-4.4/zram-fix-operator-precedence-to-get-offset.patch
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Patch "zram: fix operator precedence to get offset" has been added to the 4.4-stable tree
2017-04-18 12:49 Patch "zram: fix operator precedence to get offset" has been added to the 4.4-stable tree gregkh
@ 2017-04-19 0:58 ` Minchan Kim
0 siblings, 0 replies; 2+ messages in thread
From: Minchan Kim @ 2017-04-19 0:58 UTC (permalink / raw)
To: gregkh; +Cc: akpm, sergey.senozhatsky, torvalds, stable, stable-commits
Hello Greg,
On Tue, Apr 18, 2017 at 02:49:47PM +0200, gregkh@linuxfoundation.org wrote:
>
> This is a note to let you know that I've just added the patch titled
>
> zram: fix operator precedence to get offset
>
> to the 4.4-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:
> zram-fix-operator-precedence-to-get-offset.patch
> and it can be found in the queue-4.4 subdirectory.
>
> If you, or anyone else, feels it should not be added to the stable tree,
> please let <stable@vger.kernel.org> know about it.
>
>
> From 4ca82dabc9fbf7bc5322aa54d802cb3cb7b125c5 Mon Sep 17 00:00:00 2001
> From: Minchan Kim <minchan@kernel.org>
> Date: Thu, 13 Apr 2017 14:56:35 -0700
> Subject: zram: fix operator precedence to get offset
>
> From: Minchan Kim <minchan@kernel.org>
>
> commit 4ca82dabc9fbf7bc5322aa54d802cb3cb7b125c5 upstream.
>
> In zram_rw_page, the logic to get offset is wrong by operator precedence
> (i.e., "<<" is higher than "&"). With wrong offset, zram can corrupt
> the user's data. This patch fixes it.
>
> Fixes: 8c7f01025 ("zram: implement rw_page operation of zram")
> Link: http://lkml.kernel.org/r/1492042622-12074-1-git-send-email-minchan@kernel.org
> Signed-off-by: Minchan Kim <minchan@kernel.org>
> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
After Linus merging this patch, I got realized that patch itself is correct
but no need to apply this patch to the stable by review from Sergey.
Sorry about the noise.
Please drop this patch.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2017-04-18 12:49 Patch "zram: fix operator precedence to get offset" has been added to the 4.4-stable tree gregkh
2017-04-19 0:58 ` Minchan Kim
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