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[Emacs-diffs] emacs-26 22aa665: Reject invalid 5-byte sequences when det
From: |
Eli Zaretskii |
Subject: |
[Emacs-diffs] emacs-26 22aa665: Reject invalid 5-byte sequences when detecting UTF-8 encoding |
Date: |
Fri, 15 Jun 2018 10:41:18 -0400 (EDT) |
branch: emacs-26
commit 22aa665c9b536775a28ff2e4907afc31b69ccb21
Author: Eli Zaretskii <address@hidden>
Commit: Eli Zaretskii <address@hidden>
Reject invalid 5-byte sequences when detecting UTF-8 encoding
* src/coding.c (detect_coding_utf_8): Reject multibyte sequences
whose leading byte is greater than MAX_MULTIBYTE_LEADING_CODE.
(Bug#31829)
* src/character.h (MAX_MULTIBYTE_LEADING_CODE): Add commentary
about the connection between the value of this macro and MAX_CHAR.
---
src/character.h | 3 ++-
src/coding.c | 5 ++++-
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/src/character.h b/src/character.h
index 1f21b2a..bc65759 100644
--- a/src/character.h
+++ b/src/character.h
@@ -57,7 +57,8 @@ INLINE_HEADER_BEGIN
/* Minimum leading code of multibyte characters. */
#define MIN_MULTIBYTE_LEADING_CODE 0xC0
-/* Maximum leading code of multibyte characters. */
+/* Maximum leading code of multibyte characters. Note: this must be
+ updated if we ever increase MAX_CHAR above. */
#define MAX_MULTIBYTE_LEADING_CODE 0xF8
/* Unicode character values. */
diff --git a/src/coding.c b/src/coding.c
index e756ba1..b1eb2ed 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -1225,7 +1225,10 @@ detect_coding_utf_8 (struct coding_system *coding,
ONE_MORE_BYTE (c4);
if (c4 < 0 || ! UTF_8_EXTRA_OCTET_P (c4))
break;
- if (UTF_8_5_OCTET_LEADING_P (c))
+ if (UTF_8_5_OCTET_LEADING_P (c)
+ /* If we ever need to increase MAX_CHAR, the below may need
+ to be reviewed. */
+ && c < MAX_MULTIBYTE_LEADING_CODE)
{
nchars++;
continue;
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