linux-kernel - [PATCH 5.7 079/163] lib: fix bitmap_parse() on 64-bit big endian archs

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Date:   Tue, 16 Jun 2020 17:34:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alexander Gordeev <agordeev@...ux.ibm.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Yury Norov <yury.norov@...il.com>,
        Amritha Nambiar <amritha.nambiar@...el.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Kees Cook <keescook@...omium.org>,
        Matthew Wilcox <willy@...radead.org>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        "Tobin C . Harding" <tobin@...nel.org>,
        Vineet Gupta <vineet.gupta1@...opsys.com>,
        Will Deacon <will.deacon@....com>,
        Willem de Bruijn <willemb@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 5.7 079/163] lib: fix bitmap_parse() on 64-bit big endian archs

From: Alexander Gordeev <agordeev@...ux.ibm.com>

commit 81c4f4d924d5d009b5ed785a3e22b18d0f7b831f upstream.

Commit 2d6261583be0 ("lib: rework bitmap_parse()") does not take into
account order of halfwords on 64-bit big endian architectures.  As
result (at least) Receive Packet Steering, IRQ affinity masks and
runtime kernel test "test_bitmap" get broken on s390.

[andriy.shevchenko@...ux.intel.com: convert infinite while loop to a for loop]
  Link: http://lkml.kernel.org/r/20200609140535.87160-1-andriy.shevchenko@linux.intel.com

Fixes: 2d6261583be0 ("lib: rework bitmap_parse()")
Signed-off-by: Alexander Gordeev <agordeev@...ux.ibm.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Yury Norov <yury.norov@...il.com>
Cc: Amritha Nambiar <amritha.nambiar@...el.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Kees Cook <keescook@...omium.org>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Miklos Szeredi <mszeredi@...hat.com>
Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
Cc: Steffen Klassert <steffen.klassert@...unet.com>
Cc: "Tobin C . Harding" <tobin@...nel.org>
Cc: Vineet Gupta <vineet.gupta1@...opsys.com>
Cc: Will Deacon <will.deacon@....com>
Cc: Willem de Bruijn <willemb@...gle.com>
Cc: <stable@...r.kernel.org>
Link: http://lkml.kernel.org/r/1591634471-17647-1-git-send-email-agordeev@linux.ibm.com
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 lib/bitmap.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -740,8 +740,9 @@ int bitmap_parse(const char *start, unsi
 	int chunks = BITS_TO_U32(nmaskbits);
 	u32 *bitmap = (u32 *)maskp;
 	int unset_bit;
+	int chunk;

-	while (1) {
+	for (chunk = 0; ; chunk++) {
 		end = bitmap_find_region_reverse(start, end);
 		if (start > end)
 			break;
@@ -749,7 +750,11 @@ int bitmap_parse(const char *start, unsi
 		if (!chunks--)
 			return -EOVERFLOW;

-		end = bitmap_get_x32_reverse(start, end, bitmap++);
+#if defined(CONFIG_64BIT) && defined(__BIG_ENDIAN)
+		end = bitmap_get_x32_reverse(start, end, &bitmap[chunk ^ 1]);
+#else
+		end = bitmap_get_x32_reverse(start, end, &bitmap[chunk]);
+#endif
 		if (IS_ERR(end))
 			return PTR_ERR(end);
 	}