linux-kernel - [PATCH 6.1 0/1] f2fs: convert to MAX_SBI_FLAG instead of 32 in stat

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Message-ID: <20240924120411.34948-1-n.zhandarovich@fintech.ru>
Date: Tue, 24 Sep 2024 05:04:10 -0700
From: Nikita Zhandarovich <n.zhandarovich@...tech.ru>
To: <stable@...r.kernel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC: Nikita Zhandarovich <n.zhandarovich@...tech.ru>, Jaegeuk Kim
	<jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
	<linux-f2fs-devel@...ts.sourceforge.net>, <linux-kernel@...r.kernel.org>,
	<lvc-project@...uxtesting.org>
Subject: [PATCH 6.1 0/1] f2fs: convert to MAX_SBI_FLAG instead of 32 in stat_show()

This patch addresses an open issue of buffer overflow in
f2fs function stat_show(). On the off chance that si->sbi->s_flag
had one of its bits (on the higher end) set to 1, for_each_set_bit()
will loop more than s_flag[] can afford, leading in turn to
erroneous array access.

The issue in question has been fixed in commit 5bb9c111cd98
("f2fs: convert to MAX_SBI_FLAG instead of 32 in stat_show()") and
cherry-picked for 6.1 stable branch.

Modified patch can now be cleanly applied to linux-6.1.y. All of
the changes made to the patch in order to adapt it are described
at the end of commit message in [PATCH 6.1 1/1] f2fs: convert to
MAX_SBI_FLAG instead of 32 in stat_show().