linux-kernel - [PATCH AUTOSEL 4.14 68/89] partitions/aix: append null character to print data from disk

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Date:   Sun, 2 Sep 2018 13:07:32 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Mauricio Faria de Oliveira <mfo@...onical.com>,
        Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.14 68/89] partitions/aix: append null character to
 print data from disk

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

[ Upstream commit d43fdae7bac2def8c4314b5a49822cb7f08a45f1 ]

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: Sasha Levin <alexander.levin@...rosoft.com>
---
 block/partitions/aix.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/block/partitions/aix.c b/block/partitions/aix.c
index 007f95eea0e1..238aca56f552 100644
--- a/block/partitions/aix.c
+++ b/block/partitions/aix.c
@@ -282,10 +282,14 @@ int aix_partition(struct parsed_partitions *state)
 				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);
-- 
2.17.1