diff options
Diffstat (limited to 'debian/patches/99_CVE-2021-26937.patch')
| -rw-r--r-- | debian/patches/99_CVE-2021-26937.patch | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/debian/patches/99_CVE-2021-26937.patch b/debian/patches/99_CVE-2021-26937.patch new file mode 100644 index 0000000..336d9fe --- /dev/null +++ b/debian/patches/99_CVE-2021-26937.patch @@ -0,0 +1,64 @@ +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 + +--- a/encoding.c ++++ b/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)); +@@ -1256,6 +1256,8 @@ + {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, +@@ -1323,11 +1325,12 @@ + } + + 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; +@@ -1389,9 +1392,9 @@ + { + /* 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"); +@@ -1415,7 +1418,7 @@ + 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 */ |