The patch titled
Subject: mm-fadvise-fix-signed-overflow-ubsan-complaint-fix
has been added to the -mm tree. Its filename is
mm-fadvise-fix-signed-overflow-ubsan-complaint-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-fadvise-fix-signed-overflow-ubsan-complaint-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-fadvise-fix-signed-overflow-ubsan-complaint-fix.patch
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------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: mm-fadvise-fix-signed-overflow-ubsan-complaint-fix
add comment explaining the casts
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: <icytxw@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
diff -puN mm/fadvise.c~mm-fadvise-fix-signed-overflow-ubsan-complaint-fix mm/fadvise.c
--- a/mm/fadvise.c~mm-fadvise-fix-signed-overflow-ubsan-complaint-fix
+++ a/mm/fadvise.c
@@ -72,7 +72,11 @@ int ksys_fadvise64_64(int fd, loff_t off
goto out;
}
- /* Careful about overflows. Len == 0 means "as much as possible" */
+ /*
+ * Careful about overflows. Len == 0 means "as much as possible". Use
+ * unsigned math because signed overflows are undefined and UBSan
+ * complains.
+ */
endbyte = (u64)offset + (u64)len;
if (!len || endbyte < len)
endbyte = -1;
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
i-need-old-gcc.patch
arm-arch-arm-include-asm-pageh-needs-personalityh.patch
ocfs2-return-erofs-when-filesystem-becomes-read-only-checkpatch-fixes.patch
mm.patch
tools-modifying-page-types-to-include-shared-map-counts-checkpatch-fixes.patch
tools-adding-support-for-idle-page-tracking-to-tool-fix.patch
mm-drop-vm_bug_on-from-__get_free_pages-fix.patch
mm-list_lruc-fold-__list_lru_count_one-into-its-caller.patch
mm-fadvise-fix-signed-overflow-ubsan-complaint-fix.patch
mm-sparsemem-defer-the-ms-section_mem_map-clearing-fix.patch
list_lru-prefetch-neighboring-list-entries-before-acquiring-lock-fix.patch
mm-oom-cgroup-aware-oom-killer-fix.patch
mm-oom-cgroup-aware-oom-killer-fix-2.patch
mm-oom-docs-describe-the-cgroup-aware-oom-killer-fix-2-fix.patch
kernel-hung_taskc-allow-to-set-checking-interval-separately-from-timeout-fix.patch
linux-next-rejects.patch
kernel-forkc-export-kernel_thread-to-modules.patch
slab-leaks3-default-y.patch
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