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Allocate minimum size necessary in pango text functions. (#3473)

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* Allocate minimum size necessary in pango text functions.

* Handle malloc failure.
This commit is contained in:
Connor Edwards 2019-01-20 14:03:30 +00:00 committed by emersion
parent a3d3504072
commit 9df3a9136c
2 changed files with 23 additions and 12 deletions
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1
.gitignore vendored
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@ -5,6 +5,7 @@ install_manifest.txt
bin/ bin/
test/ test/
build/ build/
build-*/
.lvimrc .lvimrc
config-debug config-debug
wayland-*-protocol.* wayland-*-protocol.*

34
common/pango.c
View file

@ -10,10 +10,6 @@
#include "log.h" #include "log.h"
#include "stringop.h" #include "stringop.h"
#define MAX_CHARS 16384
static const char overflow[] = "[buffer overflow]";
size_t escape_markup_text(const char *src, char *dest) { size_t escape_markup_text(const char *src, char *dest) {
size_t length = 0; size_t length = 0;
if (dest) { if (dest) {
@ -88,13 +84,19 @@ PangoLayout *get_pango_layout(cairo_t *cairo, const char *font,
void get_text_size(cairo_t *cairo, const char *font, int *width, int *height, void get_text_size(cairo_t *cairo, const char *font, int *width, int *height,
int *baseline, double scale, bool markup, const char *fmt, ...) { int *baseline, double scale, bool markup, const char *fmt, ...) {
char buf[MAX_CHARS];
va_list args; va_list args;
va_start(args, fmt); va_start(args, fmt);
if (vsnprintf(buf, sizeof(buf), fmt, args) >= MAX_CHARS) { // Add one since vsnprintf excludes null terminator.
strcpy(&buf[sizeof(buf) - sizeof(overflow)], overflow); int length = vsnprintf(NULL, 0, fmt, args) + 1;
va_end(args);
char *buf = malloc(length);
if (buf == NULL) {
wlr_log(WLR_ERROR, "Failed to allocate memory");
return;
} }
va_start(args, fmt);
vsnprintf(buf, length, fmt, args);
va_end(args); va_end(args);
PangoLayout *layout = get_pango_layout(cairo, font, buf, scale, markup); PangoLayout *layout = get_pango_layout(cairo, font, buf, scale, markup);
@ -104,17 +106,24 @@ void get_text_size(cairo_t *cairo, const char *font, int *width, int *height,
*baseline = pango_layout_get_baseline(layout) / PANGO_SCALE; *baseline = pango_layout_get_baseline(layout) / PANGO_SCALE;
} }
g_object_unref(layout); g_object_unref(layout);
free(buf);
} }
void pango_printf(cairo_t *cairo, const char *font, void pango_printf(cairo_t *cairo, const char *font,
double scale, bool markup, const char *fmt, ...) { double scale, bool markup, const char *fmt, ...) {
char buf[MAX_CHARS];
va_list args; va_list args;
va_start(args, fmt); va_start(args, fmt);
if (vsnprintf(buf, sizeof(buf), fmt, args) >= MAX_CHARS) { // Add one since vsnprintf excludes null terminator.
strcpy(&buf[sizeof(buf) - sizeof(overflow)], overflow); int length = vsnprintf(NULL, 0, fmt, args) + 1;
va_end(args);
char *buf = malloc(length);
if (buf == NULL) {
wlr_log(WLR_ERROR, "Failed to allocate memory");
return;
} }
va_start(args, fmt);
vsnprintf(buf, length, fmt, args);
va_end(args); va_end(args);
PangoLayout *layout = get_pango_layout(cairo, font, buf, scale, markup); PangoLayout *layout = get_pango_layout(cairo, font, buf, scale, markup);
@ -125,4 +134,5 @@ void pango_printf(cairo_t *cairo, const char *font,
pango_cairo_update_layout(cairo, layout); pango_cairo_update_layout(cairo, layout);
pango_cairo_show_layout(cairo, layout); pango_cairo_show_layout(cairo, layout);
g_object_unref(layout); g_object_unref(layout);
free(buf);
} }