Sishuai Gong c709c7ca02 configfs: fix a race in configfs_lookup() ... commit c42dd069be upstream. When configfs_lookup() is executing list_for_each_entry(), it is possible that configfs_dir_lseek() is calling list_del(). Some unfortunate interleavings of them can cause a kernel NULL pointer dereference error Thread 1 Thread 2 //configfs_dir_lseek() //configfs_lookup() list_del(&cursor->s_sibling); list_for_each_entry(sd, ...) Fix this by grabbing configfs_dirent_lock in configfs_lookup() while iterating ->s_children. Signed-off-by: Sishuai Gong <sishuai@purdue.edu> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Kyle Zeng <zengyhkyle@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-09-19 12:20:03 +02:00
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configfs_internal.h	configfs: calculate the symlink target only once	2019-09-11 12:46:14 +02:00
dir.c	configfs: fix a race in configfs_lookup()	2023-09-19 12:20:03 +02:00
file.c	configfs: fix memleak in configfs_release_bin_file	2021-07-14 16:56:48 +02:00
inode.c	docs: filesystems: convert configfs.txt to ReST	2020-05-05 09:23:25 -06:00
item.c	docs: filesystems: convert configfs.txt to ReST	2020-05-05 09:23:25 -06:00
Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
mount.c	configfs: calculate the symlink target only once	2019-09-11 12:46:14 +02:00
symlink.c	configfs: calculate the depth of parent item	2019-11-06 18:36:01 +01:00