File multipath-tools-fix-sysfs_attr_get_value of Package multipath-tools

From 67c3b7d8d0ec6f438d11c02c0ad78041ef67d924 Mon Sep 17 00:00:00 2001
From: Hannes Reinecke <hare@suse.de>
Date: Wed, 7 Jan 2009 10:52:25 +0100
Subject: [PATCH] Fix sysfs_attr_get_value()

sysfs_attr_get_value() should return NULL if the attribute was not
found or found to be empty. And we should increase the attribute
value size to avoid overflows.
And overflows should be truncated, not ignored.

References: bnc#456747

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 libmultipath/structs.h |    2 +-
 libmultipath/sysfs.c   |    8 +++++---
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/libmultipath/structs.h b/libmultipath/structs.h
index 75bd379..8596e8d 100644
--- a/libmultipath/structs.h
+++ b/libmultipath/structs.h
@@ -10,7 +10,7 @@
 #define CALLOUT_MAX_SIZE	128
 #define BLK_DEV_SIZE		33
 #define PATH_SIZE		512
-#define NAME_SIZE		128
+#define NAME_SIZE		512
 
 
 #define SCSI_VENDOR_SIZE	9
diff --git a/libmultipath/sysfs.c b/libmultipath/sysfs.c
index c0d4d5f..e00a101 100644
--- a/libmultipath/sysfs.c
+++ b/libmultipath/sysfs.c
@@ -445,8 +445,10 @@ char *sysfs_attr_get_value(const char *devpath, const char *attr_name)
 	close(fd);
 	if (size < 0)
 		goto out;
-	if (size == sizeof(value))
-		goto out;
+	if (size == sizeof(value)) {
+		dbg("overflow in attribute '%s', truncating", path_full);
+		size--;
+	}
 
 	/* got a valid value, store and return it */
 	value[size] = '\0';
@@ -456,7 +458,7 @@ char *sysfs_attr_get_value(const char *devpath, const char *attr_name)
 	attr->value = attr->value_local;
 
 out:
-	return attr->value;
+	return attr && attr->value && strlen(attr->value) ? attr->value : NULL;
 }
 
 int sysfs_lookup_devpath_by_subsys_id(char *devpath_full, size_t len,
-- 
1.6.0.2