This is a note to let you know that I've just added the patch titled
cxl: fix potential NULL dereference in free_adapter()
to the 4.7-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:
cxl-fix-potential-null-dereference-in-free_adapter.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8fbaa51d43ef2c6a72849ec34060910723a0365f Mon Sep 17 00:00:00 2001
From: Andrew Donnellan <andrew.donnellan@xxxxxxxxxxx>
Date: Fri, 15 Jul 2016 17:20:36 +1000
Subject: cxl: fix potential NULL dereference in free_adapter()
From: Andrew Donnellan <andrew.donnellan@xxxxxxxxxxx>
commit 8fbaa51d43ef2c6a72849ec34060910723a0365f upstream.
If kzalloc() fails when allocating adapter->guest in
cxl_guest_init_adapter(), we call free_adapter() before erroring out.
free_adapter() in turn attempts to dereference adapter->guest, which in
this case is NULL.
In free_adapter(), skip the adapter->guest cleanup if adapter->guest is
NULL.
Fixes: 14baf4d9c739 ("cxl: Add guest-specific code")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Andrew Donnellan <andrew.donnellan@xxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/misc/cxl/guest.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
--- a/drivers/misc/cxl/guest.c
+++ b/drivers/misc/cxl/guest.c
@@ -1052,16 +1052,18 @@ static void free_adapter(struct cxl *ada
struct irq_avail *cur;
int i;
- if (adapter->guest->irq_avail) {
- for (i = 0; i < adapter->guest->irq_nranges; i++) {
- cur = &adapter->guest->irq_avail[i];
- kfree(cur->bitmap);
+ if (adapter->guest) {
+ if (adapter->guest->irq_avail) {
+ for (i = 0; i < adapter->guest->irq_nranges; i++) {
+ cur = &adapter->guest->irq_avail[i];
+ kfree(cur->bitmap);
+ }
+ kfree(adapter->guest->irq_avail);
}
- kfree(adapter->guest->irq_avail);
+ kfree(adapter->guest->status);
+ kfree(adapter->guest);
}
- kfree(adapter->guest->status);
cxl_remove_adapter_nr(adapter);
- kfree(adapter->guest);
kfree(adapter);
}
Patches currently in stable-queue which might be from andrew.donnellan@xxxxxxxxxxx are
queue-4.7/cxl-fix-potential-null-dereference-in-free_adapter.patch
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