benet: Avoid potential null deref in be_cmd_get_seeprom_data()

Found by: Jesper Juhl <jj@chaosbits.net>

Signed-off-by: Ajit Khaparde <ajit.khaparde@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/benet/be_cmds.c b/drivers/net/benet/be_cmds.c
index 0c7811faf72cca865eb7725a76cc0b4c4ecbef7d..a179cc6d79f2e636aad7ac5ca4899855f8ec8de0 100644 (file)
--- a/drivers/net/benet/be_cmds.c
+++ b/drivers/net/benet/be_cmds.c
@@ -1786,6 +1786,10 @@ int be_cmd_get_seeprom_data(struct be_adapter *adapter,
        spin_lock_bh(&adapter->mcc_lock);
 
        wrb = wrb_from_mccq(adapter);
+       if (!wrb) {
+               status = -EBUSY;
+               goto err;
+       }
        req = nonemb_cmd->va;
        sge = nonembedded_sgl(wrb);
 
@@ -1801,6 +1805,7 @@ int be_cmd_get_seeprom_data(struct be_adapter *adapter,
 
        status = be_mcc_notify_wait(adapter);
 
+err:
        spin_unlock_bh(&adapter->mcc_lock);
        return status;
 }