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57e9d49c54
linux/fs/cachefiles
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David Howells c3d6569a43 cachefiles, erofs: Fix NULL deref in when cachefiles is not doing ondemand-mode 
cachefiles_ondemand_init_object() as called from cachefiles_open_file() and
cachefiles_create_tmpfile() does not check if object->ondemand is set
before dereferencing it, leading to an oops something like:

	RIP: 0010:cachefiles_ondemand_init_object+0x9/0x41
	...
	Call Trace:
	 <TASK>
	 cachefiles_open_file+0xc9/0x187
	 cachefiles_lookup_cookie+0x122/0x2be
	 fscache_cookie_state_machine+0xbe/0x32b
	 fscache_cookie_worker+0x1f/0x2d
	 process_one_work+0x136/0x208
	 process_scheduled_works+0x3a/0x41
	 worker_thread+0x1a2/0x1f6
	 kthread+0xca/0xd2
	 ret_from_fork+0x21/0x33

Fix this by making cachefiles_ondemand_init_object() return immediately if
cachefiles->ondemand is NULL.

Fixes: 3c5ecfe16e ("cachefiles: extract ondemand info field from cachefiles_object")
Reported-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Gao Xiang <xiang@kernel.org>
cc: Chao Yu <chao@kernel.org>
cc: Yue Hu <huyue2@coolpad.com>
cc: Jeffle Xu <jefflexu@linux.alibaba.com>
cc: linux-erofs@lists.ozlabs.org
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
2024-01-22 22:25:15 +00:00
..
cache.c cachefiles: Check that the backing filesystem supports tmpfiles 2022-01-21 21:36:28 +00:00
daemon.c cachefiles: add restore command to recover inflight ondemand read requests 2023-11-25 16:03:57 +01:00
error_inject.c cachefiles: Remove the now superfluous sentinel element from ctl_table array 2023-12-28 04:57:57 -08:00
interface.c cachefiles: extract ondemand info field from cachefiles_object 2023-11-25 16:03:57 +01:00
internal.h vfs-6.8.netfs 2024-01-19 09:10:23 -08:00
io.c vfs-6.8.netfs 2024-01-19 09:10:23 -08:00
Kconfig netfs, fscache: Combine fscache with netfs 2023-12-24 15:08:46 +00:00
key.c cachefiles: Implement key to filename encoding 2022-01-07 13:42:16 +00:00
main.c cachefiles: Implement object lifecycle funcs 2022-01-07 13:42:08 +00:00
Makefile cachefiles: notify the user daemon when looking up cookie 2022-05-18 00:11:17 +08:00
namei.c rename(): avoid a deadlock in the case of parents having no common ancestor 2023-11-25 02:54:14 -05:00
ondemand.c cachefiles, erofs: Fix NULL deref in when cachefiles is not doing ondemand-mode 2024-01-22 22:25:15 +00:00
security.c cachefiles: Add security derivation 2022-01-07 13:41:14 +00:00
volume.c fscache, cachefiles: Store the volume coherency data 2022-01-07 13:43:03 +00:00
xattr.c fs: port ->permission() to pass mnt_idmap 2023-01-19 09:24:28 +01:00