This is a note to let you know that I've just added the patch titled
dax: fix general protection fault in dax_alloc_inode
to the 4.14-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:
dax-fix-general-protection-fault-in-dax_alloc_inode.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9f586fff6574f6ecbf323f92d44ffaf0d96225fe Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Date: Tue, 14 Nov 2017 09:59:54 -0500
Subject: dax: fix general protection fault in dax_alloc_inode
From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
commit 9f586fff6574f6ecbf323f92d44ffaf0d96225fe upstream.
Don't crash in case of allocation failure in dax_alloc_inode.
syzkaller hit the following crash on e4880bc5dfb1
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
[..]
RIP: 0010:dax_alloc_inode+0x3b/0x70 drivers/dax/super.c:348
Call Trace:
alloc_inode+0x65/0x180 fs/inode.c:208
new_inode_pseudo+0x69/0x190 fs/inode.c:890
new_inode+0x1c/0x40 fs/inode.c:919
mount_pseudo_xattr+0x288/0x560 fs/libfs.c:261
mount_pseudo include/linux/fs.h:2137 [inline]
dax_mount+0x2e/0x40 drivers/dax/super.c:388
mount_fs+0x66/0x2d0 fs/super.c:1223
Fixes: 7b6be8444e0f ("dax: refactor dax-fs into a generic provider...")
Reported-by: syzbot <syzkaller@xxxxxxxxxxxxxxxx>
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/dax/super.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -344,6 +344,9 @@ static struct inode *dax_alloc_inode(str
struct inode *inode;
dax_dev = kmem_cache_alloc(dax_cache, GFP_KERNEL);
+ if (!dax_dev)
+ return NULL;
+
inode = &dax_dev->inode;
inode->i_rdev = 0;
return inode;
Patches currently in stable-queue which might be from mpatocka@xxxxxxxxxx are
queue-4.14/dm-allocate-struct-mapped_device-with-kvzalloc.patch
queue-4.14/dm-integrity-allow-unaligned-bv_offset.patch
queue-4.14/dm-crypt-allow-unaligned-bv_offset.patch
queue-4.14/dax-fix-general-protection-fault-in-dax_alloc_inode.patch