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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Johannes Berg <johannes@sipsolutions.net>,
        =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= <toke@redhat.com>,
        Johannes Berg <johannes.berg@intel.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.3 090/135] net/fq_impl: Switch to kvmalloc() for memory allocation
Date:   Tue,  3 Dec 2019 23:35:30 +0100
Message-Id: <20191203213036.344531573@linuxfoundation.org>
In-Reply-To: <20191203213005.828543156@linuxfoundation.org>
References: <20191203213005.828543156@linuxfoundation.org>
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From: Toke Høiland-Jørgensen <toke@redhat.com>

[ Upstream commit 71e67c3bd127cfe7863f54e4b087eba1cc8f9a7a ]

The FQ implementation used by mac80211 allocates memory using kmalloc(),
which can fail; and Johannes reported that this actually happens in
practice.

To avoid this, switch the allocation to kvmalloc() instead; this also
brings fq_impl in line with all the FQ qdiscs.

Fixes: 557fc4a09803 ("fq: add fair queuing framework")
Reported-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20191105155750.547379-1-toke@redhat.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 include/net/fq_impl.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/net/fq_impl.h b/include/net/fq_impl.h
index 107c0d700ed6f..38a9a3d1222b7 100644
--- a/include/net/fq_impl.h
+++ b/include/net/fq_impl.h
@@ -313,7 +313,7 @@ static int fq_init(struct fq *fq, int flows_cnt)
 	fq->limit = 8192;
 	fq->memory_limit = 16 << 20; /* 16 MBytes */
 
-	fq->flows = kcalloc(fq->flows_cnt, sizeof(fq->flows[0]), GFP_KERNEL);
+	fq->flows = kvcalloc(fq->flows_cnt, sizeof(fq->flows[0]), GFP_KERNEL);
 	if (!fq->flows)
 		return -ENOMEM;
 
@@ -331,7 +331,7 @@ static void fq_reset(struct fq *fq,
 	for (i = 0; i < fq->flows_cnt; i++)
 		fq_flow_reset(fq, &fq->flows[i], free_func);
 
-	kfree(fq->flows);
+	kvfree(fq->flows);
 	fq->flows = NULL;
 }
 
-- 
2.20.1