linux-kernel - [PATCH 3.16 082/328] partitions/aix: append null character to print data from disk

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Date:   Sun, 09 Dec 2018 21:50:33 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Mauricio Faria de Oliveira" <mfo@...onical.com>,
        "Jens Axboe" <axboe@...nel.dk>,
        "Daniel J. Axtens" <daniel.axtens@...onical.com>
Subject: [PATCH 3.16 082/328] partitions/aix: append null character to
 print data from disk

3.16.62-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Mauricio Faria de Oliveira <mfo@...onical.com>

commit d43fdae7bac2def8c4314b5a49822cb7f08a45f1 upstream.

Even if properly initialized, the lvname array (i.e., strings)
is read from disk, and might contain corrupt data (e.g., lack
the null terminating character for strings).

So, make sure the partition name string used in pr_warn() has
the null terminating character.

Fixes: 6ceea22bbbc8 ("partitions: add aix lvm partition support files")
Suggested-by: Daniel J. Axtens <daniel.axtens@...onical.com>
Signed-off-by: Mauricio Faria de Oliveira <mfo@...onical.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 block/partitions/aix.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/block/partitions/aix.c
+++ b/block/partitions/aix.c
@@ -282,10 +282,14 @@ int aix_partition(struct parsed_partitio
 				next_lp_ix += 1;
 		}
 		for (i = 0; i < state->limit; i += 1)
-			if (lvip[i].pps_found && !lvip[i].lv_is_contiguous)
+			if (lvip[i].pps_found && !lvip[i].lv_is_contiguous) {
+				char tmp[sizeof(n[i].name) + 1]; // null char
+
+				snprintf(tmp, sizeof(tmp), "%s", n[i].name);
 				pr_warn("partition %s (%u pp's found) is "
 					"not contiguous\n",
-					n[i].name, lvip[i].pps_found);
+					tmp, lvip[i].pps_found);
+			}
 		kfree(pvd);
 	}
 	kfree(n);