65 lines
2.0 KiB
Diff
65 lines
2.0 KiB
Diff
Description: [CVE-2021-26937] Fix out of bounds array access
|
|
Author: Michael Schröder <mls@suse.de>
|
|
Bug-Debian: https://bugs.debian.org/982435
|
|
Bug: https://savannah.gnu.org/bugs/?60030
|
|
Bug: https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html
|
|
Bug-OSS-Security: https://www.openwall.com/lists/oss-security/2021/02/09/3
|
|
Origin: https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00010.html
|
|
|
|
--- encoding.c.orig
|
|
+++ encoding.c
|
|
@@ -43,7 +43,7 @@
|
|
# ifdef UTF8
|
|
static int recode_char __P((int, int, int));
|
|
static int recode_char_to_encoding __P((int, int));
|
|
-static void comb_tofront __P((int, int));
|
|
+static void comb_tofront __P((int));
|
|
# ifdef DW_CHARS
|
|
static int recode_char_dw __P((int, int *, int, int));
|
|
static int recode_char_dw_to_encoding __P((int, int *, int));
|
|
@@ -1263,6 +1263,8 @@
|
|
{0x30000, 0x3FFFD},
|
|
};
|
|
|
|
+ if (c >= 0xdf00 && c <= 0xdfff)
|
|
+ return 1; /* dw combining sequence */
|
|
return ((bisearch(c, wide, sizeof(wide) / sizeof(struct interval) - 1)) ||
|
|
(cjkwidth &&
|
|
bisearch(c, ambiguous,
|
|
@@ -1330,11 +1332,12 @@
|
|
}
|
|
|
|
static void
|
|
-comb_tofront(root, i)
|
|
-int root, i;
|
|
+comb_tofront(i)
|
|
+int i;
|
|
{
|
|
for (;;)
|
|
{
|
|
+ int root = i >= 0x700 ? 0x801 : 0x800;
|
|
debug1("bring to front: %x\n", i);
|
|
combchars[combchars[i]->prev]->next = combchars[i]->next;
|
|
combchars[combchars[i]->next]->prev = combchars[i]->prev;
|
|
@@ -1396,9 +1399,9 @@
|
|
{
|
|
/* full, recycle old entry */
|
|
if (c1 >= 0xd800 && c1 < 0xe000)
|
|
- comb_tofront(root, c1 - 0xd800);
|
|
+ comb_tofront(c1 - 0xd800);
|
|
i = combchars[root]->prev;
|
|
- if (c1 == i + 0xd800)
|
|
+ if (i == 0x800 || i == 0x801 || c1 == i + 0xd800)
|
|
{
|
|
/* completely full, can't recycle */
|
|
debug("utf8_handle_comp: completely full!\n");
|
|
@@ -1422,7 +1425,7 @@
|
|
mc->font = (i >> 8) + 0xd8;
|
|
mc->fontx = 0;
|
|
debug3("combinig char %x %x -> %x\n", c1, c, i + 0xd800);
|
|
- comb_tofront(root, i);
|
|
+ comb_tofront(i);
|
|
}
|
|
|
|
#else /* !UTF8 */
|