From: Karel Zak <kzak@redhat.com>
Date: Thu, 2 Jun 2022 14:02:54 +0000 (+0200)
Subject: libblkid: (mac) make sure block size is large enough [fuzzing]
X-Git-Tag: v2.38.1~40
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c372e1bedc0a7aba422c0a299ca32dff8156ab3c;p=thirdparty%2Futil-linux.git

libblkid: (mac) make sure block size is large enough [fuzzing]

Reported-by: Thibault Guittet <tguittet@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/libblkid/src/partitions/mac.c b/libblkid/src/partitions/mac.c
index 092d31d322..75a558b0a3 100644
--- a/libblkid/src/partitions/mac.c
+++ b/libblkid/src/partitions/mac.c
@@ -93,6 +93,8 @@ static int probe_mac_pt(blkid_probe pr,
 	}
 
 	block_size = be16_to_cpu(md->block_size);
+	if (block_size < sizeof(struct mac_partition))
+		goto nothing;
 
 	/* The partition map always begins at physical block 1,
 	 * the second block on the disk.