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authorMatthias Clasen <mclasen@redhat.com>2021-12-05 10:45:52 -0500
committerMatthias Clasen <mclasen@redhat.com>2021-12-05 10:51:24 -0500
commitf5fdfe4e16b7da761d918f40bb82dad52513c9ff (patch)
treef7e3e22790db7532672e73fddabfaa18ffc891c0
parentc1254259233dc9916cf1983d8e51d5441a0ab617 (diff)
downloadpango-f5fdfe4e16b7da761d918f40bb82dad52513c9ff.tar.gz
Fix a crash in tab handlingtab-crash-fix
When we uninsert the current tab run, we need to reset our tab state to prevent last_tab->glyphs to become a dangling pointer. Test included. Fixes: #634
-rw-r--r--pango/pango-layout.c22
-rw-r--r--tests/layouts/tab-crash.layout1429
-rw-r--r--tests/meson.build1
3 files changed, 1449 insertions, 3 deletions
diff --git a/pango/pango-layout.c b/pango/pango-layout.c
index 060420a8..ed46d57a 100644
--- a/pango/pango-layout.c
+++ b/pango/pango-layout.c
@@ -3775,6 +3775,7 @@ insert_run (PangoLayoutLine *line,
if (state->last_tab.glyphs && run->glyphs != state->last_tab.glyphs)
{
gboolean found_decimal = FALSE;
+ int width;
/* Adjust the tab position so placing further runs will continue to
* maintain the tab placement. In the case of decimal tabs, we are
@@ -3794,9 +3795,10 @@ insert_run (PangoLayoutLine *line,
state->last_tab.width += width;
}
- state->last_tab.glyphs->glyphs[0].geometry.width = MAX (state->last_tab.pos - state->last_tab.width, 0);
+ width = MAX (state->last_tab.pos - state->last_tab.width, 0);
+ state->last_tab.glyphs->glyphs[0].geometry.width = width;
- if (found_decimal)
+ if (found_decimal || width == 0)
state->last_tab.glyphs = NULL;
}
}
@@ -4494,7 +4496,21 @@ process_line (PangoLayout *layout,
case BREAK_NONE_FIT:
/* Back up over unused runs to run where there is a break */
while (line->runs && line->runs != break_link)
- state->items = g_list_prepend (state->items, uninsert_run (line));
+ {
+ PangoLayoutRun *run = line->runs->data;
+
+ /* If we uninsert the current tab run,
+ * we need to reset the tab state
+ */
+ if (run->glyphs == state->last_tab.glyphs)
+ {
+ state->last_tab.glyphs = NULL;
+ state->last_tab.index = 0;
+ state->last_tab.align = PANGO_TAB_LEFT;
+ }
+
+ state->items = g_list_prepend (state->items, uninsert_run (line));
+ }
state->start_offset = break_start_offset;
state->remaining_width = break_remaining_width;
diff --git a/tests/layouts/tab-crash.layout b/tests/layouts/tab-crash.layout
new file mode 100644
index 00000000..a0e83f5d
--- /dev/null
+++ b/tests/layouts/tab-crash.layout
@@ -0,0 +1,1429 @@
+{
+ "context" : {
+ "font" : "Monospace 12",
+ "language" : "en-us",
+ "base-gravity" : "south",
+ "gravity-hint" : "natural",
+ "base-dir" : "ltr",
+ "round-glyph-positions" : true,
+ "transform" : [
+ 1,
+ 0,
+ 0,
+ 1,
+ 0,
+ 0
+ ]
+ },
+ "comment" : "Reproducer for #634, crash when the tab run gets uninserted",
+ "text" : "id=3 UNION ALL SELECT NULL, NULL, CONCAT(0x7373737373, 0x73323173656374657374), NULL--\t\t\t\t-->(MYSQL)",
+ "attributes" : [
+ {
+ "end" : 101,
+ "type" : "font-desc",
+ "value" : "Monospace 12"
+ }
+ ],
+ "tabs" : {
+ "positions-in-pixels" : true,
+ "positions" : [
+ {
+ "position" : 80,
+ "alignment" : "left",
+ "decimal-point" : 0
+ }
+ ]
+ },
+ "width" : 587776,
+ "output" : {
+ "is-wrapped" : true,
+ "is-ellipsized" : false,
+ "unknown-glyphs" : 0,
+ "width" : 585728,
+ "height" : 585728,
+ "log-attrs" : [
+ {
+ "char-break" : true,
+ "cursor-position" : true,
+ "word-start" : true,
+ "sentence-boundary" : true,
+ "sentence-start" : true,
+ "backspace-deletes-character" : true,
+ "word-boundary" : true
+ },
+ {
+ "char-break" : true,
+ "cursor-position" : true,
+ "break-inserts-hyphen" : true
+ },
+ {
+ "char-break" : true,
+ "cursor-position" : true,
+ "word-end" : true,
+ "word-boundary" : true
+ },
+ {
+ "char-break" : true,
+ "cursor-position" : true,
+ "word-start" : true,
+ "word-boundary" : true
+ },
+ {
+ "char-break" : true,
+ "white" : true,
+ "cursor-position" : true,
+ "word-end" : true,
+ "expandable-space" : true,
+ "word-boundary" : true
+ },
+ {
+ "line-break" : true,
+ "char-break" : true,
+ "cursor-position" : true,
+ "word-start" : true,
+ "word-boundary" : true
+ },
+ {
+ "char-break" : true,
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diff --git a/tests/meson.build b/tests/meson.build
index 2658f0a2..2acf0def 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -118,6 +118,7 @@ installed_test_layouts_data = [
'layouts/valid-20.layout',
'layouts/valid-21.layout',
'layouts/valid-22.layout',
+ 'layouts/tab-crash.layout',
]
test_markups_data = [