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.carpen...@oracle.com>
Reviewed-by: Chao Yu <yuch...@huawei.com>
Signed-off-by: Gao Xiang <gaoxian...@huawei.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
_______________________________________________
devel mailing list
de...@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
