Patch "nfp: Fix memory leak in nfp_cpp_area_cache_add()" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    nfp: Fix memory leak in nfp_cpp_area_cache_add()

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfp-fix-memory-leak-in-nfp_cpp_area_cache_add.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From c56c96303e9289cc34716b1179597b6f470833de Mon Sep 17 00:00:00 2001
From: Jianglei Nie <niejianglei2021@xxxxxxx>
Date: Thu, 9 Dec 2021 14:15:11 +0800
Subject: nfp: Fix memory leak in nfp_cpp_area_cache_add()

From: Jianglei Nie <niejianglei2021@xxxxxxx>

commit c56c96303e9289cc34716b1179597b6f470833de upstream.

In line 800 (#1), nfp_cpp_area_alloc() allocates and initializes a
CPP area structure. But in line 807 (#2), when the cache is allocated
failed, this CPP area structure is not freed, which will result in
memory leak.

We can fix it by freeing the CPP area when the cache is allocated
failed (#2).

792 int nfp_cpp_area_cache_add(struct nfp_cpp *cpp, size_t size)
793 {
794 	struct nfp_cpp_area_cache *cache;
795 	struct nfp_cpp_area *area;

800	area = nfp_cpp_area_alloc(cpp, NFP_CPP_ID(7, NFP_CPP_ACTION_RW, 0),
801 				  0, size);
	// #1: allocates and initializes

802 	if (!area)
803 		return -ENOMEM;

805 	cache = kzalloc(sizeof(*cache), GFP_KERNEL);
806 	if (!cache)
807 		return -ENOMEM; // #2: missing free

817	return 0;
818 }

Fixes: 4cb584e0ee7d ("nfp: add CPP access core")
Signed-off-by: Jianglei Nie <niejianglei2021@xxxxxxx>
Acked-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20211209061511.122535-1-niejianglei2021@xxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_cppcore.c
@@ -803,8 +803,10 @@ int nfp_cpp_area_cache_add(struct nfp_cp
 		return -ENOMEM;
 
 	cache = kzalloc(sizeof(*cache), GFP_KERNEL);
-	if (!cache)
+	if (!cache) {
+		nfp_cpp_area_free(area);
 		return -ENOMEM;
+	}
 
 	cache->id = 0;
 	cache->addr = 0;


Patches currently in stable-queue which might be from niejianglei2021@xxxxxxx are

queue-5.15/nfp-fix-memory-leak-in-nfp_cpp_area_cache_add.patch



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