linux-kernel - [PATCH AUTOSEL 5.7 327/388] nfsd: safer handling of corrupted c

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Date:   Wed, 17 Jun 2020 21:07:04 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "J. Bruce Fields" <bfields@...hat.com>,
        Sasha Levin <sashal@...nel.org>, linux-nfs@...r.kernel.org
Subject: [PATCH AUTOSEL 5.7 327/388] nfsd: safer handling of corrupted c_type

From: "J. Bruce Fields" <bfields@...hat.com>

[ Upstream commit c25bf185e57213b54ea0d632ac04907310993433 ]

This can only happen if there's a bug somewhere, so let's make it a WARN
not a printk.  Also, I think it's safest to ignore the corruption rather
than trying to fix it by removing a cache entry.

Signed-off-by: J. Bruce Fields <bfields@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfsd/nfscache.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c
index 0c10bfea039e..4a258065188e 100644
--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -469,8 +469,7 @@ nfsd_cache_lookup(struct svc_rqst *rqstp)
 		rtn = RC_REPLY;
 		break;
 	default:
-		printk(KERN_WARNING "nfsd: bad repcache type %d\n", rp->c_type);
-		nfsd_reply_cache_free_locked(b, rp, nn);
+		WARN_ONCE(1, "nfsd: bad repcache type %d\n", rp->c_type);
 	}
 
 	goto out;
-- 
2.25.1