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net/smc: remove freed buffer from list 

Two buffers are allocated for each SMC connection. Each buffer is
added to a buffer list after creation. When the second buffer
allocation fails, the first buffer is freed but not deleted from
the list. This might result in crashes when another connection picks
up the freed buffer later and starts to work with it.

Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Fixes: 6511aad3f0 ("net/smc: change smc_buf_free function parameters")
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul 2020-07-18 15:06:17 +02:00 committed by David S. Miller
parent 741a49a4dc
commit fd7f3a7465
1 changed files with 5 additions and 1 deletions
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6
net/smc/smc_core.c
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@ -1772,8 +1772,12 @@ int smc_buf_create(struct smc_sock *smc, bool is_smcd)
return rc;
/* create rmb */
rc = __smc_buf_create(smc, is_smcd, true);
if (rc)
if (rc) {
mutex_lock(&smc->conn.lgr->sndbufs_lock);
list_del(&smc->conn.sndbuf_desc->list);
mutex_unlock(&smc->conn.lgr->sndbufs_lock);
smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
}
return rc;
}