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linux/fs/exfat
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Artem Labazov 9eb78c2532 exfat: Avoid allocating upcase table using kcalloc() 
The table for Unicode upcase conversion requires an order-5 allocation,
which may fail on a highly-fragmented system:

 pool-udisksd: page allocation failure: order:5,
 mode:0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null),
 cpuset=/,mems_allowed=0
 CPU: 4 PID: 3756880 Comm: pool-udisksd Tainted: G U
 5.8.10-200.fc32.x86_64 #1
 Hardware name: Dell Inc. XPS 13 9360/0PVG6D, BIOS 2.13.0 11/14/2019
 Call Trace:
  dump_stack+0x6b/0x88
  warn_alloc.cold+0x75/0xd9
  ? _cond_resched+0x16/0x40
  ? __alloc_pages_direct_compact+0x144/0x150
  __alloc_pages_slowpath.constprop.0+0xcfa/0xd30
  ? __schedule+0x28a/0x840
  ? __wait_on_bit_lock+0x92/0xa0
  __alloc_pages_nodemask+0x2df/0x320
  kmalloc_order+0x1b/0x80
  kmalloc_order_trace+0x1d/0xa0
  exfat_create_upcase_table+0x115/0x390 [exfat]
  exfat_fill_super+0x3ef/0x7f0 [exfat]
  ? sget_fc+0x1d0/0x240
  ? exfat_init_fs_context+0x120/0x120 [exfat]
  get_tree_bdev+0x15c/0x250
  vfs_get_tree+0x25/0xb0
  do_mount+0x7c3/0xaf0
  ? copy_mount_options+0xab/0x180
  __x64_sys_mount+0x8e/0xd0
  do_syscall_64+0x4d/0x90
  entry_SYSCALL_64_after_hwframe+0x44/0xa9

Make the driver use kvcalloc() to eliminate the issue.

Fixes: 370e812b3e ("exfat: add nls operations")
Cc: stable@vger.kernel.org #v5.7+
Signed-off-by: Artem Labazov <123321artyom@gmail.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
2020-12-22 12:31:17 +09:00
..
balloc.c exfat: remove EXFAT_SB_DIRTY flag 2020-08-12 08:31:10 +09:00
cache.c exfat: fix use of uninitialized spinlock on error path 2020-10-07 14:27:13 +09:00
dir.c exfat: remove 'rwoffset' in exfat_inode_info 2020-10-22 08:29:11 +09:00
exfat_fs.h exfat: remove 'rwoffset' in exfat_inode_info 2020-10-22 08:29:11 +09:00
exfat_raw.h exfat: retain 'VolumeFlags' properly 2020-08-12 08:31:13 +09:00
fatent.c exfat: optimize exfat_zeroed_cluster() 2020-08-12 08:31:12 +09:00
file.c exfat: remove 'rwoffset' in exfat_inode_info 2020-10-22 08:29:11 +09:00
inode.c exfat: remove 'rwoffset' in exfat_inode_info 2020-10-22 08:29:11 +09:00
Kconfig exfat: Improve wording of EXFAT_DEFAULT_IOCHARSET config option 2020-06-09 16:48:39 +09:00
Makefile exfat: add Kconfig and Makefile 2020-03-05 21:00:40 -05:00
misc.c exfat: write multiple sectors at once 2020-08-12 08:31:11 +09:00
namei.c exfat: remove useless check in exfat_move_file() 2020-10-22 08:29:12 +09:00
nls.c exfat: Avoid allocating upcase table using kcalloc() 2020-12-22 12:31:17 +09:00
super.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-24 12:26:05 -07:00