| Message ID | 20201204133348.555024-1-123321artyom@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] exfat: Avoid allocating upcase table using kcalloc() | expand |
> 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. > > Cc: stable@vger.kernel.org # v5.7+ > Signed-off-by: Artem Labazov <123321artyom@gmail.com> > --- > v2: replace vmalloc with vzalloc to avoid uninitialized memory access Applied. Thanks for your work!
diff --git a/fs/exfat/nls.c b/fs/exfat/nls.c index 675d0e7058c5..4cb2e2bc8cad 100644 --- a/fs/exfat/nls.c +++ b/fs/exfat/nls.c @@ -6,6 +6,7 @@ #include <linux/string.h> #include <linux/slab.h> #include <linux/buffer_head.h> +#include <linux/vmalloc.h> #include <asm/unaligned.h> #include "exfat_raw.h" @@ -659,7 +660,7 @@ 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); + upcase_table = vzalloc(UTBL_COUNT * sizeof(unsigned short)); if (!upcase_table) return -ENOMEM; @@ -715,7 +716,7 @@ 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); + upcase_table = vzalloc(UTBL_COUNT * sizeof(unsigned short)); if (!upcase_table) return -ENOMEM; @@ -803,5 +804,5 @@ int exfat_create_upcase_table(struct super_block *sb) void exfat_free_upcase_table(struct exfat_sb_info *sbi) { - kfree(sbi->vol_utbl); + vfree(sbi->vol_utbl); }
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. Cc: stable@vger.kernel.org # v5.7+ Signed-off-by: Artem Labazov <123321artyom@gmail.com> --- v2: replace vmalloc with vzalloc to avoid uninitialized memory access fs/exfat/nls.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)