linux-kernel - [PATCH v3] mkfs.f2fs: ensure zone size is a multiple of segment size

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Message-ID: <20250527165411.3724453-1-daeho43@gmail.com>
Date: Tue, 27 May 2025 09:54:11 -0700
From: Daeho Jeong <daeho43@...il.com>
To: linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	kernel-team@...roid.com
Cc: Daeho Jeong <daehojeong@...gle.com>
Subject: [PATCH v3] mkfs.f2fs: ensure zone size is a multiple of segment size

From: Daeho Jeong <daehojeong@...gle.com>

Otherwise, it doesn't work with a crash.

Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
---
v3: make the condition to be a multiple of segment size
v2: relocate the code
---
 lib/libf2fs.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/libf2fs.c b/lib/libf2fs.c
index d2579d7..7a9245e 100644
--- a/lib/libf2fs.c
+++ b/lib/libf2fs.c
@@ -1347,6 +1347,12 @@ int f2fs_get_f2fs_info(void)
 			}
 			c.zone_blocks = c.devices[i].zone_blocks;
 		}
+		if (!c.zone_blocks ||
+				(c.zone_blocks % DEFAULT_BLOCKS_PER_SEGMENT)) {
+			MSG(0, "\tError: zone size should be a multiple of "
+				"segment size\n");
+			return -1;
+		}
 
 		/*
 		 * Align sections to the device zone size and align F2FS zones
-- 
2.49.0.1151.ga128411c76-goog