Patch "block: fix signed int overflow in Amiga partition support" has been added to the 5.4-stable tree

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This is a note to let you know that I've just added the patch titled

    block: fix signed int overflow in Amiga partition support

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     block-fix-signed-int-overflow-in-amiga-partition-support.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From fc3d092c6bb48d5865fec15ed5b333c12f36288c Mon Sep 17 00:00:00 2001
From: Michael Schmitz <schmitzmic@xxxxxxxxx>
Date: Wed, 21 Jun 2023 08:17:23 +1200
Subject: block: fix signed int overflow in Amiga partition support

From: Michael Schmitz <schmitzmic@xxxxxxxxx>

commit fc3d092c6bb48d5865fec15ed5b333c12f36288c upstream.

The Amiga partition parser module uses signed int for partition sector
address and count, which will overflow for disks larger than 1 TB.

Use sector_t as type for sector address and size to allow using disks
up to 2 TB without LBD support, and disks larger than 2 TB with LBD.

This bug was reported originally in 2012, and the fix was created by
the RDB author, Joanne Dow <jdow@xxxxxxxxxxxxx>. A patch had been
discussed and reviewed on linux-m68k at that time but never officially
submitted. This patch differs from Joanne's patch only in its use of
sector_t instead of unsigned int. No checking for overflows is done
(see patch 3 of this series for that).

Reported-by: Martin Steigerwald <Martin@xxxxxxxxxxxx>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=43511
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Message-ID: <201206192146.09327.Martin@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 5.2
Signed-off-by: Michael Schmitz <schmitzmic@xxxxxxxxx>
Tested-by: Martin Steigerwald <Martin@xxxxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Link: https://lore.kernel.org/r/20230620201725.7020-2-schmitzmic@xxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 block/partitions/amiga.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/block/partitions/amiga.c
+++ b/block/partitions/amiga.c
@@ -32,7 +32,8 @@ int amiga_partition(struct parsed_partit
 	unsigned char *data;
 	struct RigidDiskBlock *rdb;
 	struct PartitionBlock *pb;
-	int start_sect, nr_sects, blk, part, res = 0;
+	sector_t start_sect, nr_sects;
+	int blk, part, res = 0;
 	int blksize = 1;	/* Multiplier for disk block size */
 	int slot = 1;
 	char b[BDEVNAME_SIZE];
@@ -100,14 +101,14 @@ int amiga_partition(struct parsed_partit
 
 		/* Tell Kernel about it */
 
-		nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
-			    be32_to_cpu(pb->pb_Environment[9])) *
+		nr_sects = ((sector_t)be32_to_cpu(pb->pb_Environment[10]) + 1 -
+			   be32_to_cpu(pb->pb_Environment[9])) *
 			   be32_to_cpu(pb->pb_Environment[3]) *
 			   be32_to_cpu(pb->pb_Environment[5]) *
 			   blksize;
 		if (!nr_sects)
 			continue;
-		start_sect = be32_to_cpu(pb->pb_Environment[9]) *
+		start_sect = (sector_t)be32_to_cpu(pb->pb_Environment[9]) *
 			     be32_to_cpu(pb->pb_Environment[3]) *
 			     be32_to_cpu(pb->pb_Environment[5]) *
 			     blksize;


Patches currently in stable-queue which might be from schmitzmic@xxxxxxxxx are

queue-5.4/block-change-all-__u32-annotations-to-__be32-in-affs_hardblocks.h.patch
queue-5.4/block-fix-signed-int-overflow-in-amiga-partition-support.patch



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