linux-kernel - [PATCH v7 3/4] lib/cmdline.c Remove quotes symmetrically.

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Date:   Thu, 17 Aug 2017 22:14:30 +0200
From:   Michal Suchanek <msuchanek@...e.de>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Jonathan Corbet <corbet@....net>, Jessica Yu <jeyu@...nel.org>,
        Rusty Russell <rusty@...tcorp.com.au>,
        Jason Baron <jbaron@...mai.com>,
        Hari Bathini <hbathini@...ux.vnet.ibm.com>,
        Mahesh J Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        Daniel Axtens <dja@...ens.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Suchanek <msuchanek@...e.de>,
        Thiago Jung Bauermann <bauerman@...ux.vnet.ibm.com>,
        Balbir Singh <bsingharora@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Michael Neuling <mikey@...ling.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Scott Wood <oss@...error.net>,
        "Oliver O'Halloran" <oohall@...il.com>,
        David Howells <dhowells@...hat.com>,
        "Sylvain 'ythier' Hitier" <sylvain.hitier@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     "Steven Rostedt," <rostedt@...dmis.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Tejun Heo <tj@...nel.org>, Lokesh Vutla <lokeshvutla@...com>,
        Baoquan He <bhe@...hat.com>,
        Ilya Matveychikov <matvejchikov@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v7 3/4] lib/cmdline.c Remove quotes symmetrically.

Remove quotes from argument value only if there is qoute on both sides.

Signed-off-by: Michal Suchanek <msuchanek@...e.de>
---
 arch/powerpc/kernel/fadump.c | 6 ++----
 lib/cmdline.c                | 7 ++-----
 2 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index a1614d9b8a21..d7da4ce9f7ae 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -489,10 +489,8 @@ static void __init fadump_update_params(struct param_info *param_info,
 	*tgt++ = ' ';
 
 	/* next_arg removes one leading and one trailing '"' */
-	if (*tgt == '"')
-		shortening += 1;
-	if (*(tgt + vallen + shortening) == '"')
-		shortening += 1;
+	if ((*tgt == '"') && (*(tgt + vallen + shortening) == '"'))
+		shortening += 2;
 
 	/* remove one leading and one trailing quote if both are present */
 	if ((val[0] == '"') && (val[vallen - 1] == '"')) {
diff --git a/lib/cmdline.c b/lib/cmdline.c
index 4c0888c4a68d..01e701b2afe8 100644
--- a/lib/cmdline.c
+++ b/lib/cmdline.c
@@ -227,14 +227,11 @@ char *next_arg(char *args, char **param, char **val)
 		*val = args + equals + 1;
 
 		/* Don't include quotes in value. */
-		if (**val == '"') {
+		if ((**val == '"') && (args[i-1] == '"')) {
 			(*val)++;
-			if (args[i-1] == '"')
-				args[i-1] = '\0';
+			args[i-1] = '\0';
 		}
 	}
-	if (quoted && args[i-1] == '"')
-		args[i-1] = '\0';
 
 	if (args[i]) {
 		args[i] = '\0';
-- 
2.10.2