Looking at the source code links for mm/memory.c in the sample reports
in the syzbot report links [1].
it looks like the line numbers are designated as lines that have been
increased by 1. This may seem like a problem with syzkaller or the
addr2line program that assigns the line numbers, but there is no problem
with either of them.
In the previous commit d61ea1cb0095 ("userfaultfd: UFFD_FEATURE_WP_ASYNC"),
when modifying mm/memory.c, an unknown line break is added to the very first
line of the file. However, the git.kernel.org site displays the source code
with the added line break removed, so even though addr2line has assigned
the correct line number, it looks like the line number has increased by 1.
This may seem like a trivial thing, but I think it would be appropriate
to remove all the newline characters added to the upstream and stable
versions, as they are not only incorrect in terms of code style but also
hinder bug analysis.
[1]
https://syzkaller.appspot.com/bug?extid=4145b11cdf925264bff4
https://syzkaller.appspot.com/bug?extid=fa43f1b63e3aa6f66329
https://syzkaller.appspot.com/bug?extid=890a1df7294175947697
Fixes: d61ea1cb0095 ("userfaultfd: UFFD_FEATURE_WP_ASYNC")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jeongjun Park <aha310510@xxxxxxxxx>
---
mm/memory.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/mm/memory.c b/mm/memory.c
index 2366578015ad..7dffe8749014 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1,4 +1,3 @@
-
// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/mm/memory.c
--
