[PATCH 6.12 593/602] afs: Set vllist to NULL if addr parsing fails

6.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Edward Adam Davis <[email protected]>

commit 8b3c655fa2406b9853138142746a39b7615c54a2 upstream.

syzbot reported a bug in in afs_put_vlserverlist.

  kAFS: bad VL server IP address
  BUG: unable to handle page fault for address: fffffffffffffffa
  ...
  Oops: Oops: 0002 [#1] SMP KASAN PTI
  ...
  RIP: 0010:refcount_dec_and_test include/linux/refcount.h:450 [inline]
  RIP: 0010:afs_put_vlserverlist+0x3a/0x220 fs/afs/vl_list.c:67
  ...
  Call Trace:
   <TASK>
   afs_alloc_cell fs/afs/cell.c:218 [inline]
   afs_lookup_cell+0x12a5/0x1680 fs/afs/cell.c:264
   afs_cell_init+0x17a/0x380 fs/afs/cell.c:386
   afs_proc_rootcell_write+0x21f/0x290 fs/afs/proc.c:247
   proc_simple_write+0x114/0x1b0 fs/proc/generic.c:825
   pde_write fs/proc/inode.c:330 [inline]
   proc_reg_write+0x23d/0x330 fs/proc/inode.c:342
   vfs_write+0x25c/0x1180 fs/read_write.c:682
   ksys_write+0x12a/0x240 fs/read_write.c:736
   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
   do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
   entry_SYSCALL_64_after_hwframe+0x77/0x7f

Because afs_parse_text_addrs() parses incorrectly, its return value -EINVAL
is assigned to vllist, which results in -EINVAL being used as the vllist
address when afs_put_vlserverlist() is executed.

Set the vllist value to NULL when a parsing error occurs to avoid this
issue.

Fixes: e2c2cb8ef07a ("afs: Simplify cell record handling")
Reported-by: [email protected]
Closes: https://syzkaller.appspot.com/bug?extid=5c042fbab0b292c98fc6
Tested-by: [email protected]
Signed-off-by: Edward Adam Davis <[email protected]>
Signed-off-by: David Howells <[email protected]>
Link: https://lore.kernel.org/[email protected]
cc: Marc Dionne <[email protected]>
cc: [email protected]
cc: [email protected]
Signed-off-by: Christian Brauner <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 fs/afs/cell.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/afs/cell.c
+++ b/fs/afs/cell.c
@@ -177,6 +177,7 @@ static struct afs_cell *afs_alloc_cell(s
 					      VL_SERVICE, AFS_VL_PORT);
 		if (IS_ERR(vllist)) {
 			ret = PTR_ERR(vllist);
+			vllist = NULL;
 			goto parse_failed;
 		}