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bug#9495: 24.0.50; Segfault in try_cursor_movement


From: Johan Bockgård
Subject: bug#9495: 24.0.50; Segfault in try_cursor_movement
Date: Tue, 13 Sep 2011 21:28:17 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

Program terminated with signal 11, Segmentation fault.
#0  0x00007f5bccbe6fe7 in kill () at ../sysdeps/unix/syscall-template.S:82
82      ../sysdeps/unix/syscall-template.S: No such file or directory.
        in ../sysdeps/unix/syscall-template.S
(gdb) bt
#0  0x00007f5bccbe6fe7 in kill () at ../sysdeps/unix/syscall-template.S:82
#1  0x000000000056e889 in fatal_error_signal (sig=11) at emacs.c:358
#2  <signal handler called>
#3  0x0000000000465f3f in try_cursor_movement (window=20987605, startp=...,
    scroll_step=0x7fff5e400758) at xdisp.c:14639

xdisp.c:14639: (BUFFERP (g->object) && g->charpos == PT)

g is not a valid glyph here.

(gdb) p MATRIX_ROW (w->current_matrix, w->cursor.vpos).used[TEXT_AREA]
$3 = 80
(gdb) p w->cursor.hpos
$4 = 80


2011-09-13  Johan Bockgård  <address@hidden>

        * xdisp.c (try_cursor_movement): Check bounds of hpos.

=== modified file 'src/xdisp.c'
--- src/xdisp.c 2011-09-09 01:06:52 +0000
+++ src/xdisp.c 2011-09-11 15:03:56 +0000
@@ -14627,7 +14627,11 @@ try_cursor_movement (Lisp_Object window,
                     is set, we are done.  */
                  at_zv_p =
                    MATRIX_ROW (w->current_matrix, 
w->cursor.vpos)->ends_at_zv_p;
-                 if (!at_zv_p)
+                 if (!at_zv_p
+                     && w->cursor.hpos >= 0
+                     && (w->cursor.hpos
+                         < MATRIX_ROW_USED (w->current_matrix,
+                                            w->cursor.vpos)))
                    {
                      struct glyph_row *candidate =
                        MATRIX_ROW (w->current_matrix, w->cursor.vpos);


BTW, is this code in try_window_reusing_current_matrix correct?

    struct glyph *glyph = row->glyphs[TEXT_AREA] + w->cursor.hpos;
    struct glyph *end = glyph + row->used[TEXT_AREA];

It doesn't seem right for end to depend on hpos.





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