Sungjong Seo 89fc548767 exfat: fix potential deadlock on __exfat_get_dentry_set ... 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>		2024-07-15 21:44:28 +09:00
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balloc.c	exfat: using ffs instead of internal logic	2024-01-08 21:57:21 +09:00
cache.c	mm, slab: remove last vestiges of SLAB_MEM_SPREAD	2024-03-12 20:32:19 -07:00
dir.c	exfat: fix potential deadlock on __exfat_get_dentry_set	2024-07-15 21:44:28 +09:00
exfat_fs.h	exfat: remove unused functions	2024-03-19 20:56:01 +09:00
exfat_raw.h	exfat: add ioctls for accessing attributes	2023-10-31 10:00:51 +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	exfat: handle idmapped mounts	2024-07-15 21:44:28 +09:00
inode.c	exfat: remove unused functions	2024-03-19 20:56:01 +09:00
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
misc.c	exfat: convert to new timestamp accessors	2023-10-18 13:26:21 +02:00
namei.c	exfat: remove duplicate update parent dir	2024-03-19 20:56:10 +09:00
nls.c	exfat: move freeing sbi, upcase table and dropping nls into rcu-delayed helper	2024-02-25 02:10:31 -05:00
super.c	exfat: handle idmapped mounts	2024-07-15 21:44:28 +09:00