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authorTrond Myklebust <trond.myklebust@primarydata.com>2014-02-16 12:14:13 -0500
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-02-16 13:06:06 -0500
commit9eb2ddb48ce3a7bd745c14a933112994647fa3cd (patch)
tree3ddc95def93147d05ea19eb623d97e3d984e6773 /net
parent628356791b04ea988fee070f66a748a823d001bb (diff)
SUNRPC: Ensure that gss_auth isn't freed before its upcall messages
Fix a race in which the RPC client is shutting down while the gss daemon is processing a downcall. If the RPC client manages to shut down before the gss daemon is done, then the struct gss_auth used in gss_release_msg() may have already been freed. Link: http://lkml.kernel.org/r/1392494917.71728.YahooMailNeo@web140002.mail.bf1.yahoo.com Reported-by: John <da_audiophile@yahoo.com> Reported-by: Borislav Petkov <bp@alien8.de> Cc: stable@vger.kernel.org # 3.12+ Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/auth_gss/auth_gss.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 44a61e8fda6f..1ba1fd114912 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -108,6 +108,7 @@ struct gss_auth {
static DEFINE_SPINLOCK(pipe_version_lock);
static struct rpc_wait_queue pipe_version_rpc_waitqueue;
static DECLARE_WAIT_QUEUE_HEAD(pipe_version_waitqueue);
+static void gss_put_auth(struct gss_auth *gss_auth);
static void gss_free_ctx(struct gss_cl_ctx *);
static const struct rpc_pipe_ops gss_upcall_ops_v0;
@@ -320,6 +321,7 @@ gss_release_msg(struct gss_upcall_msg *gss_msg)
if (gss_msg->ctx != NULL)
gss_put_ctx(gss_msg->ctx);
rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue);
+ gss_put_auth(gss_msg->auth);
kfree(gss_msg);
}
@@ -500,6 +502,7 @@ gss_alloc_msg(struct gss_auth *gss_auth,
if (err)
goto err_free_msg;
};
+ kref_get(&gss_auth->kref);
return gss_msg;
err_free_msg:
kfree(gss_msg);
@@ -1064,6 +1067,12 @@ gss_free_callback(struct kref *kref)
}
static void
+gss_put_auth(struct gss_auth *gss_auth)
+{
+ kref_put(&gss_auth->kref, gss_free_callback);
+}
+
+static void
gss_destroy(struct rpc_auth *auth)
{
struct gss_auth *gss_auth = container_of(auth,
@@ -1084,7 +1093,7 @@ gss_destroy(struct rpc_auth *auth)
gss_auth->gss_pipe[1] = NULL;
rpcauth_destroy_credcache(auth);
- kref_put(&gss_auth->kref, gss_free_callback);
+ gss_put_auth(gss_auth);
}
/*
@@ -1255,7 +1264,7 @@ gss_destroy_nullcred(struct rpc_cred *cred)
call_rcu(&cred->cr_rcu, gss_free_cred_callback);
if (ctx)
gss_put_ctx(ctx);
- kref_put(&gss_auth->kref, gss_free_callback);
+ gss_put_auth(gss_auth);
}
static void

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