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| author | Thomas Hebb <tommyhebb@gmail.com> | 2019-12-09 00:19:17 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-12 11:24:24 +0100 |
| commit | 0ae16c27fa54600b7830301ce96bc6b026b06631 (patch) | |
| tree | c27159681ca961d7c8c32ff4e2b3bef908e436e8 /scripts | |
| parent | 4c24585abd0fd4097dc869b3b3ff3673cb79cc31 (diff) | |
| download | linux-stable-0ae16c27fa54600b7830301ce96bc6b026b06631.tar.gz linux-stable-0ae16c27fa54600b7830301ce96bc6b026b06631.tar.bz2 linux-stable-0ae16c27fa54600b7830301ce96bc6b026b06631.zip | |
kconfig: don't crash on NULL expressions in expr_eq()
[ Upstream commit 272a72103012862e3a24ea06635253ead0b6e808 ]
NULL expressions are taken to always be true, as implemented by the
expr_is_yes() macro and by several other functions in expr.c. As such,
they ought to be valid inputs to expr_eq(), which compares two
expressions.
Signed-off-by: Thomas Hebb <tommyhebb@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/kconfig/expr.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/scripts/kconfig/expr.c b/scripts/kconfig/expr.c index ed29bad1f03a..96420b620963 100644 --- a/scripts/kconfig/expr.c +++ b/scripts/kconfig/expr.c @@ -201,6 +201,13 @@ static int expr_eq(struct expr *e1, struct expr *e2) { int res, old_count; + /* + * A NULL expr is taken to be yes, but there's also a different way to + * represent yes. expr_is_yes() checks for either representation. + */ + if (!e1 || !e2) + return expr_is_yes(e1) && expr_is_yes(e2); + if (e1->type != e2->type) return 0; switch (e1->type) { |