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nfsd: destroy percpu stats counters after reply cache shutdown 

[ Upstream commit fd5e363eac ]

Upon nfsd shutdown any pending DRC cache is freed. DRC cache use is
tracked via a percpu counter. In the current code the percpu counter
is destroyed before. If any pending cache is still present,
percpu_counter_add is called with a percpu counter==NULL. This causes
a kernel crash.
The solution is to destroy the percpu counter after the cache is freed.

Fixes: e567b98ce9 (“nfsd: protect concurrent access to nfsd stats counters”)
Signed-off-by: Julian Schroeder <jumaco@amazon.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Julian Schroeder 2022-05-23 18:52:26 +00:00 committed by Greg Kroah-Hartman
parent 2d00158a06
commit d1c8dcdb68
1 changed files with 1 additions and 1 deletions
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2
fs/nfsd/nfscache.c
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@ -212,7 +212,6 @@ void nfsd_reply_cache_shutdown(struct nfsd_net *nn)
struct svc_cacherep *rp;
unsigned int i;
nfsd_reply_cache_stats_destroy(nn);
unregister_shrinker(&nn->nfsd_reply_cache_shrinker);
for (i = 0; i < nn->drc_hashsize; i++) {
@ -223,6 +222,7 @@ void nfsd_reply_cache_shutdown(struct nfsd_net *nn)
rp, nn);
}
}
nfsd_reply_cache_stats_destroy(nn);
kvfree(nn->drc_hashtbl);
nn->drc_hashtbl = NULL;