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Do not call range_line_() with unsafe parameters in find_cmd_output

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This commit is contained in:
Kovid Goyal 2021-11-15 14:04:10 +05:30
parent 6afaec1d62
commit e771e1ea8a
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 20 additions and 11 deletions
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31
kitty/screen.c
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@ -2240,6 +2240,14 @@ range_line_(Screen *self, int y) {
return self->linebuf->line;
}
static Line*
checked_range_line(Screen *self, int y) {
if (
(y < 0 && -(y + 1) >= (int)self->historybuf->count) || y >= (int)self->lines
) return NULL;
return range_line_(self, y);
}
static bool
selection_is_left_to_right(const Selection *self) {
return self->input_start.x < self->input_current.x || (self->input_start.x == self->input_current.x && self->input_start.in_left_half_of_cell);
@ -2658,15 +2666,16 @@ find_cmd_output(Screen *self, OutputOffset *oo, index_type start_y, unsigned int
const int upward_limit = -self->historybuf->count;
const int downward_limit = self->lines - 1;
const int screen_limit = -scrolled_by + downward_limit;
Line *line = NULL;
// find around
if (direction == 0) {
Line *line = range_line_(self, y1);
if (line->attrs.prompt_kind == PROMPT_START) {
line = checked_range_line(self, y1);
if (line && line->attrs.prompt_kind == PROMPT_START) {
found_prompt = true;
// change direction to downwards to find command output
direction = 1;
} else if (line->attrs.prompt_kind == OUTPUT_START) {
} else if (line && line->attrs.prompt_kind == OUTPUT_START) {
found_output = true; start = y1;
found_prompt = true;
// keep finding the first output start upwards
@ -2679,15 +2688,15 @@ find_cmd_output(Screen *self, OutputOffset *oo, index_type start_y, unsigned int
// find around: only needs to find the first output start
// find upwards: find prompt after the output, and the first output
while (y1 >= upward_limit) {
Line *line = range_line_(self, y1);
if (line->attrs.prompt_kind == PROMPT_START) {
line = checked_range_line(self, y1);
if (line && line->attrs.prompt_kind == PROMPT_START) {
if (direction == 0) {
// find around: stop at prompt start
start = y1 + 1;
break;
}
found_next_prompt = true; end = y1;
} else if (line->attrs.prompt_kind == OUTPUT_START) {
} else if (line && line->attrs.prompt_kind == OUTPUT_START) {
start = y1;
break;
}
@ -2699,8 +2708,8 @@ find_cmd_output(Screen *self, OutputOffset *oo, index_type start_y, unsigned int
// resizing screen can cause multiple consecutive output start lines,
// so find the first one
while (start > upward_limit) {
Line *line = range_line_(self, start - 1);
if (line->attrs.prompt_kind != OUTPUT_START) break;
line = checked_range_line(self, start - 1);
if (line && line->attrs.prompt_kind != OUTPUT_START) break;
start--;
}
}
@ -2712,14 +2721,14 @@ find_cmd_output(Screen *self, OutputOffset *oo, index_type start_y, unsigned int
if (direction >= 0) {
while (y2 <= downward_limit) {
if (on_screen_only && !found_output && y2 > screen_limit) break;
Line *line = range_line_(self, y2);
if (line->attrs.prompt_kind == PROMPT_START) {
line = checked_range_line(self, y2);
if (line && line->attrs.prompt_kind == PROMPT_START) {
if (!found_prompt) found_prompt = true;
else if (found_output && !found_next_prompt) {
found_next_prompt = true; end = y2;
break;
}
} else if (line->attrs.prompt_kind == OUTPUT_START && found_prompt && !found_output) {
} else if (line && line->attrs.prompt_kind == OUTPUT_START && found_prompt && !found_output) {
found_output = true; start = y2;
}
y2++;