From 7180c1ad36a1f419e20e90ddfad0b2f77d8c018f Mon Sep 17 00:00:00 2001 From: Karel Zak Date: Thu, 2 Jun 2022 16:02:54 +0200 Subject: libblkid: (mac) make sure block size is large enough [fuzzing] Upstream: http://github.com/util-linux/util-linux/commit/4e12fbca62be10b09503cecc7507757874043474 Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2060030 Reported-by: Thibault Guittet Signed-off-by: Karel Zak --- libblkid/src/partitions/mac.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libblkid/src/partitions/mac.c b/libblkid/src/partitions/mac.c index 092d31d32..75a558b0a 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. -- 2.36.1