From: Thomas Weißschuh <thomas@t-8ch.de>
Date: Sun, 1 Oct 2023 09:48:01 +0000 (+0200)
Subject: libblkid: (lvm2) read complete superblock
X-Git-Tag: v2.40-rc1~220^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c4dad3d846bb715dbf0fb177ae3ca196139eb60e;p=thirdparty%2Futil-linux.git

libblkid: (lvm2) read complete superblock

The lvm2_calc_crc() will create a checksum over LVM2_LABEL_SIZE bytes,
which all need to be read.

Currently this works because the superblock is cached by
blkid_probe_get_idmag() which always reads 1024 bytes.

Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>
---

diff --git a/libblkid/src/superblocks/lvm.c b/libblkid/src/superblocks/lvm.c
index 71ca132021..fdd9cd6d7a 100644
--- a/libblkid/src/superblocks/lvm.c
+++ b/libblkid/src/superblocks/lvm.c
@@ -80,7 +80,7 @@ static int probe_lvm2(blkid_probe pr, const struct blkid_idmag *mag)
 
 	buf = blkid_probe_get_buffer(pr,
 			mag->kboff << 10,
-			512 + sizeof(struct lvm2_pv_label_header));
+			512 + LVM2_LABEL_SIZE);
 	if (!buf)
 		return errno ? -errno : 1;