Update of bug #52433 (project groff):
Category: None => Preprocessor html
Item Group: None => Incorrect behaviour
Status: None => Need Info
Summary: Commit [09040dbf] is wrong => Commit [09040dbf] is
wrong: bad bounds check in pre-html.cpp
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Follow-up Comment #1:
Any one got ideas about this? I'm afraid I don't understand the code well
enough to craft an exploit for it, but our anonymous submitter has a
suggestion.
Here's the commit to which he refers.
commit 09040dbf908c2563e0d918a1dca7bb564226a0f8
Author: Bálint Réczey <[email protected]>
Date: Tue Feb 16 00:16:28 2016 +0100
[pre-grohtml] Fix out-of-bounds array access (#47161).
* src/preproc/html/pre-html.cpp (char_buffer::write_upto_newline):
Implement it.
diff --git a/ChangeLog b/ChangeLog
index b3cdf1d7..b264974d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2016-02-15 Bálint Réczey <[email protected]>
+
+ [pre-grohtml] Fix out-of-bounds array access (#47161).
+
+ * src/preproc/html/pre-html.cpp (char_buffer::write_upto_newline):
+ Implement it.
+
2016-02-15 Bálint Réczey <[email protected]>
Don't use `memcpy' with NULL input or output argument (#47160).
diff --git a/src/preproc/html/pre-html.cpp b/src/preproc/html/pre-html.cpp
index 978721a1..8698149a 100644
--- a/src/preproc/html/pre-html.cpp
+++ b/src/preproc/html/pre-html.cpp
@@ -661,7 +661,7 @@ void char_buffer::write_upto_newline(char_block **t, int
*i, int is_html)
&& (*t)->buffer[j] == '\n')
j++;
writeNbytes((*t)->buffer + (*i), j - (*i));
- if ((*t)->buffer[j] == INLINE_LEADER_CHAR) {
+ if (j < char_block::SIZE && (*t)->buffer[j] == INLINE_LEADER_CHAR) {
if (can_see(t, &j, HTML_IMAGE_INLINE_BEGIN))
write_start_image(INLINE, is_html);
else if (can_see(t, &j, HTML_IMAGE_INLINE_END))
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