linux-kernel - [PATCH 3.12 067/122] kconfig: Fix warning "‘jump’ may be used uninitialized"

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Message-Id: <737a342fa7217fadd2e3c52ecfbfe1e9d307fa60.1424099973.git.jslaby@suse.cz>
Date:	Tue, 17 Feb 2015 12:34:14 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Peter Kümmel <syntheticpp@....net>,
	Michal Marek <mmarek@...e.cz>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 067/122] kconfig: Fix warning "‘jump’ may be used uninitialized"

From: Peter Kümmel <syntheticpp@....net>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 2d560306096739e2251329ab5c16059311a151b0 upstream.

Warning:
In file included from scripts/kconfig/zconf.tab.c:2537:0:
scripts/kconfig/menu.c: In function ‘get_symbol_str’:
scripts/kconfig/menu.c:590:18: warning: ‘jump’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     jump->offset = strlen(r->s);

Simplifies the test logic because (head && local) means (jump != 0)
and makes GCC happy when checking if the jump pointer was initialized.

Signed-off-by: Peter Kümmel <syntheticpp@....net>
Signed-off-by: Michal Marek <mmarek@...e.cz>
Cc: Sedat Dilek <sedat.dilek@...il.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 scripts/kconfig/menu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 2b3317010ba4..c81f055343b7 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -544,7 +544,7 @@ static void get_prompt_str(struct gstr *r, struct property *prop,
 {
 	int i, j;
 	struct menu *submenu[8], *menu, *location = NULL;
-	struct jump_key *jump;
+	struct jump_key *jump = NULL;
 
 	str_printf(r, _("Prompt: %s\n"), _(prop->text));
 	menu = prop->menu->parent;
@@ -582,7 +582,7 @@ static void get_prompt_str(struct gstr *r, struct property *prop,
 		str_printf(r, _("  Location:\n"));
 		for (j = 4; --i >= 0; j += 2) {
 			menu = submenu[i];
-			if (head && location && menu == location)
+			if (jump && menu == location)
 				jump->offset = strlen(r->s);
 			str_printf(r, "%*c-> %s", j, ' ',
 				   _(menu_get_prompt(menu)));
-- 
2.2.2

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