partitions/aix: append null character to print data from disk

[ 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@canonical.com>
Signed-off-by: Mauricio Faria de Oliveira <mfo@canonical.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/block/partitions/aix.c b/block/partitions/aix.c
index 007f95eea0e1a9b6b79751ce6f109d151daa12f4..238aca56f552b3833c2bf55ed2d34fc1001b59a5 100644 (file)
--- 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);