linux-kernel - [PATCH 4.19 043/321] net/fq_impl: Switch to kvmalloc() for memory allocation

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Message-Id: <20191203223429.350978817@linuxfoundation.org>
Date:   Tue,  3 Dec 2019 23:31:49 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johannes Berg <johannes@...solutions.net>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 043/321] net/fq_impl: Switch to kvmalloc() for memory allocation

From: Toke Høiland-Jørgensen <toke@...hat.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@...solutions.net>
Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
Link: https://lore.kernel.org/r/20191105155750.547379-1-toke@redhat.com
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.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 89a012905ef0b..4b3e18ff8e6f2 100644
--- a/include/net/fq_impl.h
+++ b/include/net/fq_impl.h
@@ -312,7 +312,7 @@ 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;
 
@@ -330,7 +330,7 @@ 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