cxgb4: fix a memory leak bug

BugLink: https://bugs.launchpad.net/bugs/1843463
[ Upstream commit c554336efa9bbc28d6ec14efbee3c7d63c61a34f ]

In blocked_fl_write(), 't' is not deallocated if bitmap_parse_user() fails,
leading to a memory leak bug. To fix this issue, free t before returning
the error.

Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
index 917663b356030f3c1fa48d0cd85a81b98d7884a8..2904dbe6a0aaeb31ac86178993d8beebd2a0f17e 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_debugfs.c
@@ -2778,8 +2778,10 @@ static ssize_t blocked_fl_write(struct file *filp, const char __user *ubuf,
                return -ENOMEM;
 
        err = bitmap_parse_user(ubuf, count, t, adap->sge.egr_sz);
-       if (err)
+       if (err) {
+               kvfree(t);
                return err;
+       }
 
        bitmap_copy(adap->sge.blocked_fl, t, adap->sge.egr_sz);
        kvfree(t);