[PATCH net 5/5] net/smc: use after free fix in smc_wr_tx_put_slot()

[Ursula Braun]

From: Ursula Braun <ursula.br...@linux.ibm.com>

In smc_wr_tx_put_slot() field pend->idx is used after being
cleared. That means always idx 0 is cleared in the wr_tx_mask.
This results in a broken administration of available WR send
payload buffers.

Signed-off-by: Ursula Braun <ubr...@linux.ibm.com>
---
 net/smc/smc_wr.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/smc/smc_wr.c b/net/smc/smc_wr.c
index 3c458d279855..c2694750a6a8 100644
--- a/net/smc/smc_wr.c
+++ b/net/smc/smc_wr.c
@@ -215,12 +215,14 @@ int smc_wr_tx_put_slot(struct smc_link *link,
 
        pend = container_of(wr_pend_priv, struct smc_wr_tx_pend, priv);
        if (pend->idx < link->wr_tx_cnt) {
+               u32 idx = pend->idx;
+
                /* clear the full struct smc_wr_tx_pend including .priv */
                memset(&link->wr_tx_pends[pend->idx], 0,
                       sizeof(link->wr_tx_pends[pend->idx]));
                memset(&link->wr_tx_bufs[pend->idx], 0,
                       sizeof(link->wr_tx_bufs[pend->idx]));
-               test_and_clear_bit(pend->idx, link->wr_tx_mask);
+               test_and_clear_bit(idx, link->wr_tx_mask);
                return 1;
        }
 
-- 
2.16.4