linux-kernel - [PATCH v5 11/11] vsprintf: Avoid confusion between invalid address and value

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Date:   Wed, 25 Apr 2018 13:12:51 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        "Tobin C . Harding" <me@...in.cc>, Joe Perches <joe@...ches.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.cz>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-kernel@...r.kernel.org, Petr Mladek <pmladek@...e.com>
Subject: [PATCH v5 11/11] vsprintf: Avoid confusion between invalid address and value

We are able to detect invalid values handled by %p[iI] printk specifier.
The current error message is "invalid address". It might cause confusion
against "(efault)" reported by the generic valid_pointer_address() check.

Let's unify the style and use the more appropriate error code description
"(einval)".

Signed-off-by: Petr Mladek <pmladek@...e.com>
---
 Documentation/core-api/printk-formats.rst | 1 +
 lib/vsprintf.c                            | 3 +--
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
index 3b25adde1ec7..e1a0ef2179f0 100644
--- a/Documentation/core-api/printk-formats.rst
+++ b/Documentation/core-api/printk-formats.rst
@@ -56,6 +56,7 @@ might be printed instead of the unreachable information::
 
 	(null)	 data on plain NULL address
 	(efault) data on invalid address
+	(einval) invalid data on a valid address
 
 Also a WARN_ON() is triggered when non-NULL address is not reachable
 and panic_on_warn is disabled.
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 46e3e7c71229..79ee96afd538 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1473,8 +1473,7 @@ char *ip_addr_string(char *buf, char *end, void *ptr, struct printf_spec spec,
 		case AF_INET6:
 			return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
 		default:
-			return valid_string(buf, end, "(invalid address)",
-					    spec);
+			return valid_string(buf, end, "(einval)", spec);
 		}}
 	}
 
-- 
2.13.6