commit 98dcbbf0bf4854bf987557e55e55fff7abbf3ea9
author Martin Matuska <martin@matuska.org> Thu Jan 19 22:00:18 2017 +0100
committer Martin Matuska <martin@matuska.org> Thu Jan 19 22:00:18 2017 +0100
tree 7ec89347a584102912b914546d9bb4fbcb320ce7
parent 42f7080f59c973446e9a61b0971f2614851c78d6

Fail with negative lha->compsize in lha_read_file_header_1()
Fixes a heap buffer overflow reported in Secunia SA74169

libarchive/archive_read_support_format_lha.c

diff --git a/libarchive/archive_read_support_format_lha.c b/libarchive/archive_read_support_format_lha.c
index 52a5531..d77a7c2 100644
--- a/libarchive/archive_read_support_format_lha.c
+++ b/libarchive/archive_read_support_format_lha.c
@@ -924,6 +924,9 @@
 	/* Get a real compressed file size. */
 	lha->compsize -= extdsize - 2;
 
+	if (lha->compsize < 0)
+		goto invalid;	/* Invalid compressed file size */
+
 	if (sum_calculated != headersum) {
 		archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 		    "LHa header sum error");