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dax: fix general protection fault in dax_alloc_inode 

commit 9f586fff65 upstream.

Don't crash in case of allocation failure in dax_alloc_inode.

    syzkaller hit the following crash on e4880bc5df

    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: 7b6be8444e ("dax: refactor dax-fs into a generic provider...")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Mikulas Patocka 2017-11-14 09:59:54 -05:00 committed by Greg Kroah-Hartman
parent c21261e631
commit d1c2e5668c
1 changed files with 3 additions and 0 deletions
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3
drivers/dax/super.c
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@ -344,6 +344,9 @@ static struct inode *dax_alloc_inode(struct super_block *sb)
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;