linux-kernel - [PATCH 1/4] EDAC: Fix calculation of returned address and next offset in edac_align

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Message-ID: <20220113100622.12783-2-farbere@amazon.com>
Date:   Thu, 13 Jan 2022 10:06:19 +0000
From:   Eliav Farber <farbere@...zon.com>
To:     <bp@...en8.de>
CC:     <mchehab@...nel.org>, <linux-edac@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <ronenk@...zon.com>,
        <talel@...zon.com>, <hhhawa@...zon.com>, <jonnyc@...zon.com>,
        <hanochu@...zon.com>, <farbere@...zon.com>
Subject: [PATCH 1/4] EDAC: Fix calculation of returned address and next offset in edac_align_ptr()

Do alignment logic properly and use 'ptr' for calculating the remainder
of the alignment.

This became an issue because 'struct edac_mc_layer' has a size that is
not zero modulo eight, and the next offset that was prepared for the
private-data was unaligned, causing an alignment exception.

Signed-off-by: Eliav Farber <farbere@...zon.com>
---
 drivers/edac/edac_mc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index fd440b35d76e..61d72bd96754 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -265,7 +265,7 @@ void *edac_align_ptr(void **p, unsigned size, int n_elems)
 	else
 		return (char *)ptr;
 
-	r = (unsigned long)p % align;
+	r = (unsigned long)ptr % align;
 
 	if (r == 0)
 		return (char *)ptr;
-- 
2.32.0