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exfat: Avoid allocating upcase table using kcalloc()

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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 vzalloc() to eliminate the issue.

Fixes: 370e812b3ec1 ("exfat: add nls operations")
Cc: stable@vger.kernel.org # v5.7+
Signed-off-by: Artem Labazov <123321artyom@gmail.com>
Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
This commit is contained in:
Namjae Jeon 2020-12-08 12:50:28 +09:00
commit 779f03e967
1 changed files with 19 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

22
nls.c
View file

@ -3,9 +3,13 @@
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*/
#include <linux/version.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/buffer_head.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0)
#include <linux/vmalloc.h>
#endif
#include <asm/unaligned.h>
#include "exfat_raw.h"
@ -659,7 +663,11 @@ static int exfat_load_upcase_table(struct super_block *sb,
unsigned char skip = false;
unsigned short *upcase_table;
upcase_table = kcalloc(UTBL_COUNT, sizeof(unsigned short), GFP_KERNEL);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)
upcase_table = kvcalloc(UTBL_COUNT, sizeof(unsigned short), GFP_KERNEL);
#else
upcase_table = vzalloc(UTBL_COUNT * sizeof(unsigned short));
#endif
if (!upcase_table)
return -ENOMEM;
@ -715,7 +723,11 @@ static int exfat_load_default_upcase_table(struct super_block *sb)
unsigned short uni = 0, *upcase_table;
unsigned int index = 0;
upcase_table = kcalloc(UTBL_COUNT, sizeof(unsigned short), GFP_KERNEL);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)
upcase_table = kvcalloc(UTBL_COUNT, sizeof(unsigned short), GFP_KERNEL);
#else
upcase_table = vzalloc(UTBL_COUNT * sizeof(unsigned short));
#endif
if (!upcase_table)
return -ENOMEM;
@ -803,5 +815,9 @@ load_default:
void exfat_free_upcase_table(struct exfat_sb_info *sbi)
{
kfree(sbi->vol_utbl);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)
kvfree(sbi->vol_utbl);
#else
vfree(sbi->vol_utbl);
#endif
}