Sungjong Seo a7ac198f8d exfat: fix potential deadlock on __exfat_get_dentry_set ... commit 89fc548767a2155231128cb98726d6d2ea1256c9 upstream. When accessing a file with more entries than ES_MAX_ENTRY_NUM, the bh-array is allocated in __exfat_get_entry_set. The problem is that the bh-array is allocated with GFP_KERNEL. It does not make sense. In the following cases, a deadlock for sbi->s_lock between the two processes may occur. CPU0 CPU1 ---- ---- kswapd balance_pgdat lock(fs_reclaim) exfat_iterate lock(&sbi->s_lock) exfat_readdir exfat_get_uniname_from_ext_entry exfat_get_dentry_set __exfat_get_dentry_set kmalloc_array ... lock(fs_reclaim) ... evict exfat_evict_inode lock(&sbi->s_lock) To fix this, let's allocate bh-array with GFP_NOFS. Fixes: a3ff29a95f ("exfat: support dynamic allocate bh for exfat_entry_set_cache") Cc: stable@vger.kernel.org # v6.2+ Reported-by: syzbot+412a392a2cd4a65e71db@syzkaller.appspotmail.com Closes: https://lore.kernel.org/lkml/000000000000fef47e0618c0327f@google.com Signed-off-by: Sungjong Seo <sj1557.seo@samsung.com> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-08-03 08:54:12 +02:00
..
Kconfig	fs: add CONFIG_BUFFER_HEAD	2023-08-02 09:13:09 -06:00
Makefile	exfat: add Kconfig and Makefile	2020-03-05 21:00:40 -05:00
balloc.c	exfat: use kvmalloc_array/kvfree instead of kmalloc_array/kfree	2023-07-11 21:33:20 +09:00
cache.c	exfat: fix use of uninitialized spinlock on error path	2020-10-07 14:27:13 +09:00
dir.c	exfat: fix potential deadlock on __exfat_get_dentry_set	2024-08-03 08:54:12 +02:00
exfat_fs.h	exfat: don't RCU-free the sbi	2023-08-10 10:34:55 +02:00
exfat_raw.h	exfat: handle unreconized benign secondary entries	2023-02-27 21:14:46 +09:00
fatent.c	exfat: fix the newly allocated clusters are not freed in error handling	2023-02-28 20:01:40 +09:00
file.c	fs: pass the request_mask to generic_fillattr	2023-08-09 08:56:36 +02:00
inode.c	exfat: convert to ctime accessor functions	2023-07-13 10:28:07 +02:00
misc.c	exfat: Expand exfat_err() and co directly to pr_*() macro	2022-08-01 10:14:07 +09:00
namei.c	exfat: support handle zero-size directory	2023-11-28 17:19:44 +00:00
nls.c	exfat: Drop superfluous new line for error messages	2022-08-01 10:14:07 +09:00
super.c	v6.6-vfs.super	2023-08-28 11:04:18 -07:00