afs: Fix overwriting of result of DNS query
a9e01ac8 · David Howells <[email protected]> · 2023-12-21 15:09:31 +00:00
In afs_update_cell(), ret is the result of the DNS lookup and the errors
are to be handled by a switch - however, the value gets clobbered in
between by setting it to -ENOMEM in case afs_alloc_vlserver_list()
fails.
Fix this by moving the setting of -ENOMEM into the error handling for
OOM failure. Further, only do it if we don't have an alternative error
to return.
Found by Linux Verification Center (linuxtesting.org) with SVACE. Based
on a patch from Anastasia Belova [1].
Fixes: d5c32c89b208 ("afs: Fix cell DNS lookup")
Signed-off-by: David Howells <[email protected]>
Reviewed-by: Jeffrey Altman <[email protected]>
cc: Anastasia Belova <[email protected]>
cc: Marc Dionne <[email protected]>
cc: [email protected]
cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]/ [1]
Link: https://lore.kernel.org/r/[email protected]/ # v1
Signed-off-by: Linus Torvalds <[email protected]>
- Commit
- a9e01ac8c5ff32669119c40dfdc9e80eb0b7d7aa
- Parents
- 937fd403
Changes
1 files changed · +4 −2
diff --git a/fs/afs/cell.c b/fs/afs/cell.c
index 988c2ac..926cb11 100644
--- a/fs/afs/cell.c
+++ b/fs/afs/cell.c
@@ -409,10 +409,12 @@ static int afs_update_cell(struct afs_cell *cell)
if (ret == -ENOMEM)
goto out_wake;
- ret = -ENOMEM;
vllist = afs_alloc_vlserver_list(0);
- if (!vllist)
+ if (!vllist) {
+ if (ret >= 0)
+ ret = -ENOMEM;
goto out_wake;
+ }
switch (ret) {
case -ENODATA: