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Subject: Prevent overflow beyond the end of string in caller of get_mclen()
From: Tatsuya Kinoshita <tats@debian.org>
Bug-Debian: https://github.com/tats/w3m/issues/59
Bug-Debian: https://github.com/tats/w3m/issues/73
Bug-Debian: https://github.com/tats/w3m/issues/74
Bug-Debian: https://github.com/tats/w3m/issues/75
Bug-Debian: https://github.com/tats/w3m/issues/76
Bug-Debian: https://github.com/tats/w3m/issues/78
Bug-Debian: https://github.com/tats/w3m/issues/79
Bug-Debian: https://github.com/tats/w3m/issues/80
Bug-Debian: https://github.com/tats/w3m/issues/83
Bug-Debian: https://github.com/tats/w3m/issues/84
Origin: https://anonscm.debian.org/cgit/collab-maint/w3m.git/commit/?id=6eea841d3a0f8dc539584dc67b15f585a8213775
---
file.c | 2 +-
libwc/wtf.c | 11 ++++++++---
libwc/wtf.h | 3 +--
3 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/file.c b/file.c
index f5ca8d2..4fe8239 100644
--- a/file.c
+++ b/file.c
@@ -3438,7 +3438,7 @@ process_img(struct parsed_tag *tag, int width)
if (use_image) {
if (n > nw) {
char *r;
- for (r = q, n = 0; r; r += get_mclen(r), n += get_mcwidth(r)) {
+ for (r = q, n = 0; *r; r += get_mclen(r), n += get_mcwidth(r)) {
if (n + get_mcwidth(r) > nw)
break;
}
diff --git a/libwc/wtf.c b/libwc/wtf.c
index adee338..e80d990 100644
--- a/libwc/wtf.c
+++ b/libwc/wtf.c
@@ -129,13 +129,18 @@ wtf_strwidth(wc_uchar *p)
return w;
}
-/*
size_t
wtf_len1(wc_uchar *p)
{
- return (size_t)WTF_LEN_MAP[*p];
+ size_t len, len_max = WTF_LEN_MAP[*p];
+
+ for (len = 0; *(p + len); len++)
+ if (len == len_max)
+ break;
+ if (len == 0)
+ len = 1;
+ return len;
}
-*/
size_t
wtf_len(wc_uchar *p)
diff --git a/libwc/wtf.h b/libwc/wtf.h
index ad47973..435526f 100644
--- a/libwc/wtf.h
+++ b/libwc/wtf.h
@@ -59,8 +59,7 @@ extern void wtf_init(wc_ces ces1, wc_ces ces2);
#define wtf_width(p) (WcOption.use_wide ? (int)WTF_WIDTH_MAP[(wc_uchar)*(p)] \
: ((int)WTF_WIDTH_MAP[(wc_uchar)*(p)] ? 1 : 0))
extern int wtf_strwidth(wc_uchar *p);
-/* extern size_t wtf_len1(wc_uchar *p); */
-#define wtf_len1(p) ((int)WTF_LEN_MAP[(wc_uchar)*(p)])
+extern size_t wtf_len1(wc_uchar *p);
extern size_t wtf_len(wc_uchar *p);
/* extern int wtf_type(wc_uchar *p); */
#define wtf_type(p) WTF_TYPE_MAP[(wc_uchar)*(p)]
--
2.10.2
|
