"double free or corruption" error appeares while i try to draw dotted line

Submitted by Sergey Pevzner

Assigned to Chris Wilson @ickle

Link to original bug (#75705)

Description

/*

"double free or corruption" error appeares while i try to draw dotted line

in case I comment line:

cairo_set_line_cap(cr, CAIRO_LINE_CAP_ROUND);

or change antialias type to CAIRO_ANTIALIAS_BEST

• all work properly

*/

#include<cstdio> #include<cairo/cairo.h>

int main() { cairo_surface_t *surface; cairo_t *cr; surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 256, 256); cr = cairo_create(surface);

cairo_set_source_rgba(cr, 0, 0, 0, 1);
cairo_paint(cr);

cairo_set_line_cap(cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);

cairo_new_path(cr);

cairo_move_to(cr, 100, 251);
cairo_line_to(cr, 100, 196);

cairo_move_to(cr, 36, 3);
cairo_line_to(cr, 107, 3);

cairo_set_antialias(cr, CAIRO_ANTIALIAS_FAST);
cairo_set_tolerance(cr, 1);

double dsh[2] = {1,3};

cairo_set_dash(cr, dsh, 2, 0);
cairo_set_source_rgba(cr, 1, 1, 1, 1);
cairo_set_line_width(cr, 2);

cairo_stroke(cr);

cairo_destroy (cr);
cairo_surface_write_to_png (surface, "hello.png");
cairo_surface_destroy (surface);

return 0;

}

Version: 1.12.16

Blocking

• Bug 68382