Zixuan Fu c381558c27 fs: jfs: fix possible NULL pointer dereference in dbFree() ... [ Upstream commit 0d4837fdb796f99369cf7691d33de1b856bcaf1f ] In our fault-injection testing, the variable "nblocks" in dbFree() can be zero when kmalloc_array() fails in dtSearch(). In this case, the variable "mp" in dbFree() would be NULL and then it is dereferenced in "write_metapage(mp)". The failure log is listed as follows: [ 13.824137] BUG: kernel NULL pointer dereference, address: 0000000000000020 ... [ 13.827416] RIP: 0010:dbFree+0x5f7/0x910 [jfs] [ 13.834341] Call Trace: [ 13.834540] <TASK> [ 13.834713] txFreeMap+0x7b4/0xb10 [jfs] [ 13.835038] txUpdateMap+0x311/0x650 [jfs] [ 13.835375] jfs_lazycommit+0x5f2/0xc70 [jfs] [ 13.835726] ? sched_dynamic_update+0x1b0/0x1b0 [ 13.836092] kthread+0x3c2/0x4a0 [ 13.836355] ? txLockFree+0x160/0x160 [jfs] [ 13.836763] ? kthread_unuse_mm+0x160/0x160 [ 13.837106] ret_from_fork+0x1f/0x30 [ 13.837402] </TASK> ... This patch adds a NULL check of "mp" before "write_metapage(mp)" is called. Reported-by: TOTE Robot <oslab@tsinghua.edu.cn> Signed-off-by: Zixuan Fu <r33s3n6@gmail.com> Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-06-14 16:59:17 +02:00
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acl.c
file.c
inode.c
ioctl.c
jfs_acl.h
jfs_btree.h
jfs_debug.c
jfs_debug.h
jfs_dinode.h
jfs_discard.c
jfs_discard.h
jfs_dmap.c	fs: jfs: fix possible NULL pointer dereference in dbFree()	2022-06-14 16:59:17 +02:00
jfs_dmap.h
jfs_dtree.c
jfs_dtree.h
jfs_extent.c
jfs_extent.h
jfs_filsys.h
jfs_imap.c
jfs_imap.h
jfs_incore.h
jfs_inode.c
jfs_inode.h
jfs_lock.h
jfs_logmgr.c
jfs_logmgr.h
jfs_metapage.c
jfs_metapage.h
jfs_mount.c
jfs_superblock.h
jfs_txnmgr.c
jfs_txnmgr.h
jfs_types.h
jfs_umount.c
jfs_unicode.c
jfs_unicode.h
jfs_uniupr.c
jfs_xattr.h
jfs_xtree.c
jfs_xtree.h
Kconfig
Makefile
namei.c
resize.c
super.c
symlink.c
xattr.c