linux-kernel - [PATCH] staging: erofs: fix potential overflow in z_erofs_vle_normalaccess

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Date:   Fri, 24 Aug 2018 10:02:40 +0800
From:   Gao Xiang <gaoxiang25@...wei.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <devel@...verdev.osuosl.org>
CC:     LKML <linux-kernel@...r.kernel.org>,
        <linux-erofs@...ts.ozlabs.org>,
        "Dan Carpenter" <dan.carpenter@...cle.com>,
        Chao Yu <yuchao0@...wei.com>, Miao Xie <miaoxie@...wei.com>,
        <weidu.du@...wei.com>, Gao Xiang <gaoxiang25@...wei.com>
Subject: [PATCH] staging: erofs: fix potential overflow in z_erofs_vle_normalaccess_readpage{,s}

As Dan reported in the LKP mailing list:
https://lists.01.org/pipermail/kbuild-all/2018-August/051558.html

New smatch warnings:
drivers/staging/erofs/unzip_vle.c:1359 z_erofs_vle_normalaccess_readpages() warn: should '()->index << 12' be a 64 bit type?

Old smatch warnings:
drivers/staging/erofs/unzip_vle.c:1322 z_erofs_vle_normalaccess_readpage() warn: should 'page->index << 12' be a 64 bit type?

It needs to cast variable's type to erofs_off_t before left shifting.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>
---

This patch is based on
`staging: erofs: fix potential overflow in erofs_grab_bio()'
of Chao Yu's previous patchset in order to
avoid patch conflict when applying.

Thanks,
Gao Xiang

 drivers/staging/erofs/unzip_vle.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c
index 6c4c928..22f9a02 100644
--- a/drivers/staging/erofs/unzip_vle.c
+++ b/drivers/staging/erofs/unzip_vle.c
@@ -1314,7 +1314,7 @@ static int z_erofs_vle_normalaccess_readpage(struct file *file,
 	LIST_HEAD(pagepool);
 
 #if (EROFS_FS_ZIP_CACHE_LVL >= 2)
-	f.cachedzone_la = page->index << PAGE_SHIFT;
+	f.cachedzone_la = (erofs_off_t)page->index << PAGE_SHIFT;
 #endif
 	err = z_erofs_do_read_page(&f, page, &pagepool);
 	(void)z_erofs_vle_work_iter_end(&f.builder);
@@ -1347,7 +1347,7 @@ static inline int __z_erofs_vle_normalaccess_readpages(
 	LIST_HEAD(pagepool);
 
 #if (EROFS_FS_ZIP_CACHE_LVL >= 2)
-	f.cachedzone_la = lru_to_page(pages)->index << PAGE_SHIFT;
+	f.cachedzone_la = (erofs_off_t)lru_to_page(pages)->index << PAGE_SHIFT;
 #endif
 	for (; nr_pages; --nr_pages) {
 		struct page *page = lru_to_page(pages);
-- 
1.9.1