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Message-ID: <adf1859b4dcc497285ebbda017ece22d@bfs.de>
Date: Wed, 4 Mar 2020 21:28:31 +0000
From: Walter Harms <wharms@....de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: "stable@...r.kernel.org" <stable@...r.kernel.org>,
Christophe JAILLET <christophe.jaillet@...adoo.fr>,
Paul Burton <paulburton@...nel.org>,
"ralf@...ux-mips.org" <ralf@...ux-mips.org>,
"linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: AW: [PATCH 5.5 110/176] MIPS: VPE: Fix a double free and a memory
leak in release_vpe()
________________________________________
Von: kernel-janitors-owner@...r.kernel.org <kernel-janitors-owner@...r.kernel.org> im Auftrag von Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Gesendet: Dienstag, 3. März 2020 18:42
An: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman; stable@...r.kernel.org; Christophe JAILLET; Paul Burton; ralf@...ux-mips.org; linux-mips@...r.kernel.org; kernel-janitors@...r.kernel.org
Betreff: [PATCH 5.5 110/176] MIPS: VPE: Fix a double free and a memory leak in release_vpe()
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
commit bef8e2dfceed6daeb6ca3e8d33f9c9d43b926580 upstream.
Pointer on the memory allocated by 'alloc_progmem()' is stored in
'v->load_addr'. So this is this memory that should be freed by
'release_progmem()'.
'release_progmem()' is only a call to 'kfree()'.
With the current code, there is both a double free and a memory leak.
Fix it by passing the correct pointer to 'release_progmem()'.
Fixes: e01402b115ccc ("More AP / SP bits for the 34K, the Malta bits and things. Still wants")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Signed-off-by: Paul Burton <paulburton@...nel.org>
Cc: ralf@...ux-mips.org
Cc: linux-mips@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: kernel-janitors@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
arch/mips/kernel/vpe.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -134,7 +134,7 @@ void release_vpe(struct vpe *v)
{
list_del(&v->list);
if (v->load_addr)
- release_progmem(v);
+ release_progmem(v->load_addr);
kfree(v);
}
since release_progmem() is kfree() it is also possible to drop "if (v->load_addr)"
jm2c
re,
wh
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