This patch adds boundary checks for nconf's i-search pattern.
Further, the pattern buffer is always bzero'ed when '/' is
pressed, so the second line in the code below was not needed (and
otherwise wouldn't have worked as expected):
state->pattern[strlen(state->pattern)] = c;
state->pattern[strlen(state->pattern)] = '\0';
Finally, the pattern length was reduced to a length that still
seems sufficient but will not fill more than the top line of the
screen, thus eliminating special treatment needs on resizes or normal
exit of i-search.
Signed-off-by: Dirk Gouders
---
scripts/kconfig/nconf.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/scripts/kconfig/nconf.c b/scripts/kconfig/nconf.c
index 97b78445584b..0e224528aaf9 100644
--- a/scripts/kconfig/nconf.c
+++ b/scripts/kconfig/nconf.c
@@ -1007,11 +1007,12 @@ static void adj_match_dir(match_f *match_direction)
/* else, do no change.. */
}
+#define PATTERN_LENGTH 64
struct match_state
{
int in_search;
match_f match_direction;
- char pattern[256];
+ char pattern[PATTERN_LENGTH];
};
/* Return 0 means I have handled the key. In such a case, ans should hold the
@@ -1035,8 +1036,8 @@ static int do_match(int key, struct match_state *state, int *ans)
return 1;
if (isalnum(c) || isgraph(c) || c == ' ') {
- state->pattern[strlen(state->pattern)] = c;
- state->pattern[strlen(state->pattern)] = '\0';
+ if (strlen(state->pattern) + 1 < PATTERN_LENGTH)
+ state->pattern[strlen(state->pattern)] = c;
adj_match_dir(&state->match_direction);
*ans = get_mext_match(state->pattern,
state->match_direction);
@@ -1049,7 +1050,8 @@ static int do_match(int key, struct match_state *state, int *ans)
*ans = get_mext_match(state->pattern,
state->match_direction);
} else if (key == KEY_BACKSPACE || key == 127) {
- state->pattern[strlen(state->pattern)-1] = '\0';
+ if (state->pattern[0] != '\0')
+ state->pattern[strlen(state->pattern)-1] = '\0';
adj_match_dir(&state->match_direction);
} else
terminate_search = 1;
--
2.16.4
--
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