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--- a/extract.c
+++ b/extract.c
@@ -1,5 +1,5 @@
/*
- Copyright (c) 1990-2009 Info-ZIP. All rights reserved.
+ Copyright (c) 1990-2014 Info-ZIP. All rights reserved.
See the accompanying file LICENSE, version 2009-Jan-02 or later
(the contents of which are also included in unzip.h) for terms of use.
@@ -298,6 +298,8 @@
#ifndef SFX
static ZCONST char Far InconsistEFlength[] = "bad extra-field entry:\n \
EF block length (%u bytes) exceeds remaining EF data (%u bytes)\n";
+ static ZCONST char Far TooSmallEBlength[] = "bad extra-field entry:\n \
+ EF block length (%u bytes) invalid (< %d)\n";
static ZCONST char Far InvalidComprDataEAs[] =
" invalid compressed data for EAs\n";
# if (defined(WIN32) && defined(NTSD_EAS))
@@ -2032,7 +2034,8 @@
ebID = makeword(ef);
ebLen = (unsigned)makeword(ef+EB_LEN);
- if (ebLen > (ef_len - EB_HEADSIZE)) {
+ if (ebLen > (ef_len - EB_HEADSIZE))
+ {
/* Discovered some extra field inconsistency! */
if (uO.qflag)
Info(slide, 1, ((char *)slide, "%-22s ",
@@ -2167,11 +2170,29 @@
}
break;
case EF_PKVMS:
- if (makelong(ef+EB_HEADSIZE) !=
- crc32(CRCVAL_INITIAL, ef+(EB_HEADSIZE+4),
- (extent)(ebLen-4)))
- Info(slide, 1, ((char *)slide,
- LoadFarString(BadCRC_EAs)));
+ /* 2015-01-30 SMS. Added sufficient-bytes test/message
+ * here. (Removed defective ebLen test above.)
+ *
+ * If sufficient bytes (EB_PKVMS_MINLEN) are available,
+ * then compare the stored CRC value with the calculated
+ * CRC for the remainder of the data (and complain about
+ * a mismatch).
+ */
+ if (ebLen < EB_PKVMS_MINLEN)
+ {
+ /* Insufficient bytes available. */
+ Info( slide, 1,
+ ((char *)slide, LoadFarString( TooSmallEBlength),
+ ebLen, EB_PKVMS_MINLEN));
+ }
+ else if (makelong(ef+ EB_HEADSIZE) !=
+ crc32(CRCVAL_INITIAL,
+ (ef+ EB_HEADSIZE+ EB_PKVMS_MINLEN),
+ (extent)(ebLen- EB_PKVMS_MINLEN)))
+ {
+ Info(slide, 1, ((char *)slide,
+ LoadFarString(BadCRC_EAs)));
+ }
break;
case EF_PKW32:
case EF_PKUNIX:
--- a/unzpriv.h
+++ b/unzpriv.h
@@ -1806,6 +1806,8 @@
#define EB_NTSD_VERSION 4 /* offset of NTSD version byte */
#define EB_NTSD_MAX_VER (0) /* maximum version # we know how to handle */
+#define EB_PKVMS_MINLEN 4 /* minimum data length of PKVMS extra block */
+
#define EB_ASI_CRC32 0 /* offset of ASI Unix field's crc32 checksum */
#define EB_ASI_MODE 4 /* offset of ASI Unix permission mode field */
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