releases/4.4.181/fbdev-fix-warning-in-__alloc_pages_nodemask-bug.patch

   1 From 8c40292be9169a9cbe19aadd1a6fc60cbd1af82f Mon Sep 17 00:00:00 2001
   2 From: Jiufei Xue <jiufei.xue@linux.alibaba.com>
   3 Date: Thu, 11 Apr 2019 19:25:12 +0200
   4 Subject: fbdev: fix WARNING in __alloc_pages_nodemask bug
   5
   6 From: Jiufei Xue <jiufei.xue@linux.alibaba.com>
   7
   8 commit 8c40292be9169a9cbe19aadd1a6fc60cbd1af82f upstream.
   9
  10 Syzkaller hit 'WARNING in __alloc_pages_nodemask' bug.
  11
  12 WARNING: CPU: 1 PID: 1473 at mm/page_alloc.c:4377
  13 __alloc_pages_nodemask+0x4da/0x2130
  14 Kernel panic - not syncing: panic_on_warn set ...
  15
  16 Call Trace:
  17  alloc_pages_current+0xb1/0x1e0
  18  kmalloc_order+0x1f/0x60
  19  kmalloc_order_trace+0x1d/0x120
  20  fb_alloc_cmap_gfp+0x85/0x2b0
  21  fb_set_user_cmap+0xff/0x370
  22  do_fb_ioctl+0x949/0xa20
  23  fb_ioctl+0xdd/0x120
  24  do_vfs_ioctl+0x186/0x1070
  25  ksys_ioctl+0x89/0xa0
  26  __x64_sys_ioctl+0x74/0xb0
  27  do_syscall_64+0xc8/0x550
  28  entry_SYSCALL_64_after_hwframe+0x49/0xbe
  29
  30 This is a warning about order >= MAX_ORDER and the order is from
  31 userspace ioctl. Add flag __NOWARN to silence this warning.
  32
  33 Signed-off-by: Jiufei Xue <jiufei.xue@linux.alibaba.com>
  34 Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
  35 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  36
  37 ---
  38  drivers/video/fbdev/core/fbcmap.c |    2 ++
  39  1 file changed, 2 insertions(+)
  40
  41 --- a/drivers/video/fbdev/core/fbcmap.c
  42 +++ b/drivers/video/fbdev/core/fbcmap.c
  43 @@ -94,6 +94,8 @@ int fb_alloc_cmap_gfp(struct fb_cmap *cm
  44         int size = len * sizeof(u16);
  45         int ret = -ENOMEM;
  46
  47 +       flags |= __GFP_NOWARN;
  48 +
  49         if (cmap->len != len) {
  50                 fb_dealloc_cmap(cmap);
  51                 if (!len)