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From 2348779e225dd581c32c00108e017f5c1924e706 Mon Sep 17 00:00:00 2001
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From: Samanta Navarro <ferivoz@riseup.net>
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Date: Sun, 8 Nov 2020 11:45:18 +0000
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Subject: libblkid: allow a lot of mac partitions
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If the map count is set to INT_MAX then the for loop does not stop
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because its check is never false.
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I have not found a correct upper limit. The other partition logics have
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a maximum amount (exception is atari.c).
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The loop itself wouldn't be endless. If the iteration reaches block 0
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then the signature will be wrong. This means that map count = INT_MAX
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case would fail even if such a setup would be correct on disk.
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Upstream: http://github.com/util-linux/util-linux/commit/8f22adaaf30e9fd3bf83da0213b4a6525c9305cd
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2060030
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Signed-off-by: Samanta Navarro <ferivoz@riseup.net>
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---
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libblkid/src/partitions/mac.c | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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diff --git a/libblkid/src/partitions/mac.c b/libblkid/src/partitions/mac.c
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index 4713d6042..2be91a620 100644
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--- a/libblkid/src/partitions/mac.c
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+++ b/libblkid/src/partitions/mac.c
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@@ -123,12 +123,12 @@ static int probe_mac_pt(blkid_probe pr,
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ssf = block_size / 512;
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nblks = be32_to_cpu(p->map_count);
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- for (i = 1; i <= nblks; ++i) {
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+ for (i = 0; i < nblks; ++i) {
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blkid_partition par;
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uint32_t start;
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uint32_t size;
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- p = (struct mac_partition *) get_mac_block(pr, block_size, i);
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+ p = (struct mac_partition *) get_mac_block(pr, block_size, i + 1);
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if (!p) {
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if (errno)
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return -errno;
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@@ -141,7 +141,7 @@ static int probe_mac_pt(blkid_probe pr,
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DBG(LOWPROBE, ul_debug(
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"mac: inconsistent map_count in partition map, "
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"entry[0]: %d, entry[%d]: %d",
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- nblks, i - 1,
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+ nblks, i,
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be32_to_cpu(p->map_count)));
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}
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--
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2.36.1
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