linux-kernel - [PATCH] s390/crash: Use the correct type for memory allocation

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Message-Id: <0756118c9058338f3040edb91971d0bfd100027b.1686688212.git.christophe.jaillet@wanadoo.fr>
Date:   Tue, 13 Jun 2023 22:30:28 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Philipp Rudo <prudo@...ux.ibm.com>,
        Michael Holzheu <holzheu@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-s390@...r.kernel.org
Subject: [PATCH] s390/crash: Use the correct type for memory allocation

get_elfcorehdr_size() returns a size_t, so there is no real point to
store it in a u32.

Turn 'alloc_size' into a size_t.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Not sure if 'alloc_size' can overflow in real life application, but using
the correct type looks harmless.

Should it be a real fix, either:
Fixes: 8cce437fbb5c ("s390/kdump: Fix elfcorehdr size calculation")
or
Fixes: 60a0c68df263 ("[S390] kdump backend code")
---
 arch/s390/kernel/crash_dump.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c
index 8a617be28bb4..7af69948b290 100644
--- a/arch/s390/kernel/crash_dump.c
+++ b/arch/s390/kernel/crash_dump.c
@@ -568,9 +568,9 @@ static size_t get_elfcorehdr_size(int mem_chunk_cnt)
 int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size)
 {
 	Elf64_Phdr *phdr_notes, *phdr_loads;
+	size_t alloc_size;
 	int mem_chunk_cnt;
 	void *ptr, *hdr;
-	u32 alloc_size;
 	u64 hdr_off;
 
 	/* If we are not in kdump or zfcp/nvme dump mode return */
-- 
2.34.1