Sungjong Seo cd1c785864 exfat: fix potential deadlock on __exfat_get_dentry_set ... commit 89fc548767 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: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-12-19 18:08:51 +01:00
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balloc.c	exfat: fix memory leak in exfat_load_bitmap()	2024-10-17 15:21:57 +02:00
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	2024-12-19 18:08:51 +01:00
exfat_fs.h	exfat: support dynamic allocate bh for exfat_entry_set_cache	2024-12-19 18:08:51 +01:00
exfat_raw.h	exfat: fix shift-out-of-bounds in exfat_fill_super()	2021-02-22 09:55:13 +09:00
fatent.c	exfat: fix overflow for large capacity partition	2022-09-04 09:38:40 +09:00
file.c	exfat: fix inode->i_blocks for non-512 byte sector size device	2023-03-10 09:34:08 +01:00
inode.c	exfat: fix inode->i_blocks for non-512 byte sector size device	2023-03-10 09:34:08 +01:00
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: Expand exfat_err() and co directly to pr_*() macro	2022-08-01 10:14:07 +09:00
namei.c	exfat: fix uninit-value in __exfat_get_dentry_set	2024-12-14 19:54:00 +01:00
nls.c	exfat: Drop superfluous new line for error messages	2022-08-01 10:14:07 +09:00
super.c	exfat: fix inode->i_blocks for non-512 byte sector size device	2023-03-10 09:34:08 +01:00