* mdocml: Make sure every layout line contains at least one cell; fixing a
@ 2015-01-30 0:30 schwarze
0 siblings, 0 replies; only message in thread
From: schwarze @ 2015-01-30 0:30 UTC (permalink / raw)
To: source
Log Message:
-----------
Make sure every layout line contains at least one cell;
fixing a NULL pointer access in term_tbl() that jsg@ found with afl.
Modified Files:
--------------
mdocml:
tbl_layout.c
Revision Data
-------------
Index: tbl_layout.c
===================================================================
RCS file: /home/cvs/mdocml/mdocml/tbl_layout.c,v
retrieving revision 1.34
retrieving revision 1.35
diff -Ltbl_layout.c -Ltbl_layout.c -u -p -r1.34 -r1.35
--- tbl_layout.c
+++ tbl_layout.c
@@ -262,11 +262,14 @@ tbl_layout(struct tbl_node *tbl, int ln,
*/
if (tbl->first_row == NULL) {
+ tbl->first_row = tbl->last_row =
+ mandoc_calloc(1, sizeof(*rp));
+ }
+ if (tbl->first_row->first == NULL) {
mandoc_msg(MANDOCERR_TBLLAYOUT_NONE,
tbl->parse, ln, pos, NULL);
- rp = mandoc_calloc(1, sizeof(*rp));
- cell_alloc(tbl, rp, TBL_CELL_LEFT);
- tbl->first_row = tbl->last_row = rp;
+ cell_alloc(tbl, tbl->first_row,
+ TBL_CELL_LEFT);
return;
}
@@ -282,19 +285,36 @@ tbl_layout(struct tbl_node *tbl, int ln,
rp->last->head == tbl->last_head &&
tbl->opts.rvert < rp->last->vert)
tbl->opts.rvert = rp->last->vert;
+
+ /* If the last line is empty, drop it. */
+
+ if (rp->next != NULL &&
+ rp->next->first == NULL) {
+ free(rp->next);
+ rp->next = NULL;
+ }
}
return;
default: /* Cell. */
break;
}
- if (rp == NULL) { /* First cell on this line. */
- rp = mandoc_calloc(1, sizeof(*rp));
- if (tbl->last_row)
- tbl->last_row->next = rp;
- else
- tbl->first_row = rp;
- tbl->last_row = rp;
+ /*
+ * If the last line had at least one cell,
+ * start a new one; otherwise, continue it.
+ */
+
+ if (rp == NULL) {
+ if (tbl->last_row == NULL ||
+ tbl->last_row->first != NULL) {
+ rp = mandoc_calloc(1, sizeof(*rp));
+ if (tbl->last_row)
+ tbl->last_row->next = rp;
+ else
+ tbl->first_row = rp;
+ tbl->last_row = rp;
+ } else
+ rp = tbl->last_row;
}
cell(tbl, rp, ln, p, &pos);
}
--
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