This is a note to let you know that I've just added the patch titled
raw: test against runtime value of max_raw_minors
to the 3.12-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:
raw-test-against-runtime-value-of-max_raw_minors.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5bbb2ae3d6f896f8d2082d1eceb6131c2420b7cf Mon Sep 17 00:00:00 2001
From: Paul Bolle <pebolle@xxxxxxxxxx>
Date: Tue, 4 Feb 2014 23:23:12 +0100
Subject: raw: test against runtime value of max_raw_minors
From: Paul Bolle <pebolle@xxxxxxxxxx>
commit 5bbb2ae3d6f896f8d2082d1eceb6131c2420b7cf upstream.
bind_get() checks the device number it is called with. It uses
MAX_RAW_MINORS for the upper bound. But MAX_RAW_MINORS is set at compile
time while the actual number of raw devices can be set at runtime. This
means the test can either be too strict or too lenient. And if the test
ends up being too lenient bind_get() might try to access memory beyond
what was allocated for "raw_devices".
So check against the runtime value (max_raw_minors) in this function.
Signed-off-by: Paul Bolle <pebolle@xxxxxxxxxx>
Acked-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/char/raw.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/char/raw.c
+++ b/drivers/char/raw.c
@@ -190,7 +190,7 @@ static int bind_get(int number, dev_t *d
struct raw_device_data *rawdev;
struct block_device *bdev;
- if (number <= 0 || number >= MAX_RAW_MINORS)
+ if (number <= 0 || number >= max_raw_minors)
return -EINVAL;
rawdev = &raw_devices[number];
Patches currently in stable-queue which might be from pebolle@xxxxxxxxxx are
queue-3.12/raw-test-against-runtime-value-of-max_raw_minors.patch
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