Making 'blk' sector_t (i.e. 64 bit if LBD support is active)
fails the 'blk>0' test in the partition block loop if a
value of (signed int) -1 is used to mark the end of the
partition block list.
This bug was introduced in patch 3 of my prior Amiga partition
support fixes series, and spotted by Christian Zigotzky when
testing the latest block updates.
Explicitly cast 'blk' to signed int to allow use of -1 to
terminate the partition block linked list.
Reported-by: Christian Zigotzky <chzigotzky@xxxxxxxxxxx>
Fixes: b6f3f28f60 ("block: add overflow checks for Amiga partition support")
Message-ID: 024ce4fa-cc6d-50a2-9aae-3701d0ebf668@xxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx> # 5.2
Link: https://lore.kernel.org/r/024ce4fa-cc6d-50a2-9aae-3701d0ebf668@xxxxxxxxxxx
Signed-off-by: Michael Schmitz <schmitzmic@xxxxxxxxx>
Reviewed-by: Martin Steigerwald <martin@xxxxxxxxxxxx>
Tested-by: Christian Zigotzky <chzigotzky@xxxxxxxxxxx>
--
Changes since v1:
- corrected Fixes: tag
- added Tested-by:
- reworded commit message to describe filesystem partition
size mismatch problem
Changes since v2:
Adrian Glaubitz:
- fix typo in commit message
Changes since v3:
Greg KH:
- fix stable tag
Geert Uytterhoeven:
- revert changes to commit message since v1
---
block/partitions/amiga.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/partitions/amiga.c b/block/partitions/amiga.c
index ed222b9c901b..506921095412 100644
--- a/block/partitions/amiga.c
+++ b/block/partitions/amiga.c
@@ -90,7 +90,7 @@ int amiga_partition(struct parsed_partitions *state)
}
blk = be32_to_cpu(rdb->rdb_PartitionList);
put_dev_sector(sect);
- for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
+ for (part = 1; (s32) blk>0 && part<=16; part++, put_dev_sector(sect)) {
/* Read in terms partition table understands */
if (check_mul_overflow(blk, (sector_t) blksize, &blk)) {
pr_err("Dev %s: overflow calculating partition block %llu! Skipping partitions %u and beyond\n",
--
2.17.1
