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authorDirk Gouders <dirk@gouders.net>2013-05-21 10:54:11 +0200
committerYann E. MORIN <yann.morin.1998@free.fr>2013-05-30 00:14:01 +0200
commite983b7b17ad1a978e954e6aaa62cf12bfc747883 (patch)
treed03b6ef41719ff23f7228ce7f32c8a352b3bc070 /Documentation/cpu-freq/governors.txt
parent063f4661fde8c03c4c03f8a205071a52691c152e (diff)
kconfig/menu.c: fix multiple references to expressions in menu_add_prop()
menu_add_prop() applies upper menus' visibilities to actual prompts by AND-ing the prompts visibilities with the upper menus ones. This creates a further reference to the menu's visibilities and when the expression reduction functions do their work, they may remove or modify expressions that have multiple references, thus causing unpredictable side-effects. The following example Kconfig constructs a case where this causes problems: a menu and a prompt which's visibilities depend on the same symbol. When invoking mconf with this Kconfig and pressing "Z" we see a problem caused by a free'd expression still referenced by the menu's visibility: ------------------------------------------------------------------------ mainmenu "Kconfig Testing Configuration" config VISIBLE def_bool n config Placeholder bool "Place holder" menu "Invisible" visible if VISIBLE config TEST_VAR bool "Test option" if VISIBLE endmenu ------------------------------------------------------------------------ This patch fixes this problem by creating copies of the menu's visibility expressions before AND-ing them with the prompt's one. Signed-off-by: Dirk Gouders <dirk@gouders.net> [yann.morin.1998@free.fr: move variable into its block-scope, keep lines <80 chars, typo] Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
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