lineedit: fix crash when icanon set with -echo

When icanon is set with -echo (e.g. ssh from an emacs shell) then
S.state will remain null but later it will be deferenced causing ash to
crash. Fix: additional check on state.

Signed-off-by: Akos Somfai <akos.somfai@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 625884adf..bdae10914 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -254,7 +254,7 @@ static NOINLINE const char *get_homedir_or_NULL(void)
         const char *home;
 
 # if ENABLE_SHELL_ASH || ENABLE_SHELL_HUSH
-        home = state->sh_get_var ? state->sh_get_var("HOME") : getenv("HOME");
+        home = state && state->sh_get_var ? state->sh_get_var("HOME") : getenv("HOME");
 # else
         home = getenv("HOME");
 # endif
@@ -2038,7 +2038,7 @@ static void parse_and_put_prompt(const char *prmt_ptr)
                                         if (!cwd_buf) {
                                                 const char *home;
 # if EDITING_HAS_sh_get_var
-                                                cwd_buf = state->sh_get_var
+                                                cwd_buf = state && state->sh_get_var
                                                         ? xstrdup(state->sh_get_var("PWD"))
                                                         : xrealloc_getcwd_or_warn(NULL);
 # else