linux-kernel - [PATCH] block: fix UUID string buffer length

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Date:	Wed,  5 Oct 2011 15:22:44 +0530
From:	Rabin Vincent <rabin@....in>
To:	axboe@...nel.dk
Cc:	linux-kernel@...r.kernel.org, Rabin Vincent <rabin@....in>,
	Will Drewry <wad@...omium.org>
Subject: [PATCH] block: fix UUID string buffer length

The UUID string buffer is several bytes shorter than what is actually
required, because the space for the hyphens hasn't been taken into
account.  Fix it, while also making it a regular char[] rather than a
u8[] to make it clear what we're storing here.

Cc: Will Drewry <wad@...omium.org>
Signed-off-by: Rabin Vincent <rabin@....in>
---
 block/genhd.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 8dfa21e..fa955b5 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -736,7 +736,7 @@ void __init printk_all_partitions(void)
 		struct hd_struct *part;
 		char name_buf[BDEVNAME_SIZE];
 		char devt_buf[BDEVT_SIZE];
-		u8 uuid[PARTITION_META_INFO_UUIDLTH * 2 + 1];
+		char uuid[sizeof("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx")];
 
 		/*
 		 * Don't show empty devices or things that have been
@@ -755,7 +755,7 @@ void __init printk_all_partitions(void)
 		while ((part = disk_part_iter_next(&piter))) {
 			bool is_part0 = part == &disk->part0;
 
-			uuid[0] = 0;
+			uuid[0] = '\0';
 			if (part->info)
 				part_unpack_uuid(part->info->uuid, uuid);
 
-- 
1.7.5.4

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