linux-hardening - [PATCH 3/3][next] lib/stackdepot.c: Use array

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Message-ID: <cb8a682e4bba4dbddd2bd8aca7f8c02fea89639b.1601565471.git.gustavoars@kernel.org>
Date:   Thu, 1 Oct 2020 10:26:34 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     linux-hardening@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: [PATCH 3/3][next] lib/stackdepot.c: Use array_size() helper in
 jhash2()

Use array_size() helper instead of the open-coded version in jhash2().
These sorts of multiplication factors need to be wrapped in array_size().

Also, use the preferred form for passing the size of an object type.

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 lib/stackdepot.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 683b6a8ddade..890dcc2e984e 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -154,8 +154,8 @@ static struct stack_record *stack_table[STACK_HASH_SIZE] = {
 static inline u32 hash_stack(unsigned long *entries, unsigned int size)
 {
 	return jhash2((u32 *)entries,
-			       size * sizeof(unsigned long) / sizeof(u32),
-			       STACK_HASH_SEED);
+		      array_size(size,  sizeof(*entries)) / sizeof(u32),
+		      STACK_HASH_SEED);
 }
 
 /* Use our own, non-instrumented version of memcmp().
-- 
2.27.0