6.6-stable review patch. If anyone has any objections, please let me know.
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From: David Howells dhowells@redhat.com
[ Upstream commit a9e01ac8c5ff32669119c40dfdc9e80eb0b7d7aa ]
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 dhowells@redhat.com Reviewed-by: Jeffrey Altman jaltman@auristor.com cc: Anastasia Belova abelova@astralinux.ru cc: Marc Dionne marc.dionne@auristor.com cc: linux-afs@lists.infradead.org cc: lvc-project@linuxtesting.org Link: https://lore.kernel.org/r/20231221085849.1463-1-abelova@astralinux.ru/ [1] Link: https://lore.kernel.org/r/1700862.1703168632@warthog.procyon.org.uk/ # v1 Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/afs/cell.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/afs/cell.c b/fs/afs/cell.c index 988c2ac7cecec..926cb1188eba6 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: