File fix-pointer-arithmetic-overflow.patch of Package libmspack.20475

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File fix-pointer-arithmetic-overflow.patch of Package libmspack.20475

Extracted from git to match Debian patch and CVE

From 5692b75a21bf71dd86ac84bcfeb9ce8c0830658e Mon Sep 17 00:00:00 2001
From: Stuart Caie <kyzer@4u.net>
Date: Thu, 15 Jan 2015 00:49:08 +0000
Subject: [PATCH] better bounds checks reading CHM data, preventing segfaults

---
 libmspack/trunk/ChangeLog     | 10 ++++++++++
 libmspack/trunk/mspack/chmd.c |  8 +++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

From bef420ede1039dbdc8d6acafa2f115be2ec86bef Mon Sep 17 00:00:00 2001
From: Stuart Caie <kyzer@4u.net>
Date: Sun, 18 Jan 2015 23:05:07 +0000
Subject: [PATCH] Another fix for checking name_len is within chunk bounds

---
 libmspack/trunk/ChangeLog     | 3 +++
 libmspack/trunk/mspack/chmd.c | 6 +++---
 2 files changed, 6 insertions(+), 3 deletions(-)

From 3f8a171b95b858f2d98e60b6da8a427ef530516b Mon Sep 17 00:00:00 2001
From: Stuart Caie <kyzer@4u.net>
Date: Sun, 18 Jan 2015 23:11:39 +0000
Subject: [PATCH] better fix

---
 libmspack/trunk/ChangeLog     | 2 +-
 libmspack/trunk/mspack/chmd.c | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

#diff --git a/libmspack/trunk/ChangeLog b/libmspack/trunk/ChangeLog
#index 3472950..a7cf6f4 100644
#--- a/libmspack/trunk/ChangeLog
#+++ b/libmspack/trunk/ChangeLog
#@@ -1,3 +1,13 @@
#+2015-01-15  Stuart Caie <kyzer@4u.net>
#+
#+	* chmd_read_headers(): add a bounds check to prevent over-reading data,
#+	which caused a segfault on 32-bit architectures. Thanks to Jakub Wilk.
#+
#+	* search_chunk(): change the order of pointer arithmetic operations to
#+	avoid overflow during bounds checks, which lead to segfaults on 32-bit
#+	architectures. Again, thanks to Jakub Wilk for finding this issue,
#+	providing sample files and a patch.
#+
# 2015-01-08  Stuart Caie <kyzer@4u.net>
# 
# 	* cabd_extract(): No longer uses broken state data if extracting from
#diff --git a/libmspack/trunk/ChangeLog b/libmspack/trunk/ChangeLog
#index 97eb31b..a59c779 100644
#--- a/libmspack/trunk/ChangeLog
#+++ b/libmspack/trunk/ChangeLog
#@@ -9,6 +9,9 @@
# 	* inflate(): off-by-one error. Distance codes are 0-29, not 0-30.
# 	Thanks to Jakub Wilk again.
# 
#+	* chmd_read_headers(), search_chunk(): another fix for checking name_len
#+	is within a chunk, thanks again to Jakub Wilk.
#+
# 2015-01-17  Stuart Caie <kyzer@4u.net>
# 
# 	* GET_UTF8_CHAR(): Remove 5/6-byte encoding support and check decoded
#diff --git a/libmspack/trunk/ChangeLog b/libmspack/trunk/ChangeLog
#index a59c779..63d88b5 100644
#--- a/libmspack/trunk/ChangeLog
#+++ b/libmspack/trunk/ChangeLog
#@@ -9,7 +9,7 @@
# 	* inflate(): off-by-one error. Distance codes are 0-29, not 0-30.
# 	Thanks to Jakub Wilk again.
# 
#-	* chmd_read_headers(), search_chunk(): another fix for checking name_len
#+	* chmd_read_headers(), search_chunk(): another fix for checking pointer
# 	is within a chunk, thanks again to Jakub Wilk.
# 
# 2015-01-17  Stuart Caie <kyzer@4u.net>
diff --git a/libmspack/trunk/ChangeLog b/libmspack/trunk/ChangeLog
index 3472950..a7cf6f4 100644
Index: libmspack/mspack/chmd.c
===================================================================
--- libmspack.orig/mspack/chmd.c
+++ libmspack/mspack/chmd.c
@@ -746,7 +746,7 @@ static int search_chunk(struct mschmd_he
 	    /* compare filename with entry QR points to */
 	    p = &chunk[entries_off + (M ? EndGetI16(start - (M << 1)) : 0)];
 	    READ_ENCINT(name_len);
-	    if (p + name_len > end) goto chunk_end;
+	    if (name_len > (unsigned int) (end - p)) goto chunk_end;
 	    cmp = compare(filename, (char *)p, fname_len, name_len);
 
 	    if (cmp == 0) break;
@@ -783,7 +783,7 @@ static int search_chunk(struct mschmd_he
     *result = NULL;
     while (num_entries-- > 0) {
 	READ_ENCINT(name_len);
-	if (p + name_len > end) goto chunk_end;
+	if (name_len > (unsigned int) (end - p)) goto chunk_end;
 	cmp = compare(filename, (char *)p, fname_len, name_len);
 	p += name_len;

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File fix-pointer-arithmetic-overflow.patch of Package libmspack.20475

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