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diff --git a/extract.c b/extract.c
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index 9ef80b3..c741b5f 100644
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--- a/extract.c
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+++ b/extract.c
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@@ -1,5 +1,5 @@
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/*
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- Copyright (c) 1990-2009 Info-ZIP. All rights reserved.
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+ Copyright (c) 1990-2014 Info-ZIP. All rights reserved.
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See the accompanying file LICENSE, version 2009-Jan-02 or later
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(the contents of which are also included in unzip.h) for terms of use.
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@@ -298,6 +298,8 @@ char ZCONST Far TruncNTSD[] =
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#ifndef SFX
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static ZCONST char Far InconsistEFlength[] = "bad extra-field entry:\n \
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EF block length (%u bytes) exceeds remaining EF data (%u bytes)\n";
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+ static ZCONST char Far TooSmallEBlength[] = "bad extra-field entry:\n \
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+ EF block length (%u bytes) invalid (< %d)\n";
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static ZCONST char Far InvalidComprDataEAs[] =
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" invalid compressed data for EAs\n";
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# if (defined(WIN32) && defined(NTSD_EAS))
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@@ -2020,7 +2022,8 @@ static int TestExtraField(__G__ ef, ef_len)
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ebID = makeword(ef);
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ebLen = (unsigned)makeword(ef+EB_LEN);
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- if (ebLen > (ef_len - EB_HEADSIZE)) {
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+ if (ebLen > (ef_len - EB_HEADSIZE))
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+ {
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/* Discovered some extra field inconsistency! */
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if (uO.qflag)
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Info(slide, 1, ((char *)slide, "%-22s ",
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@@ -2155,11 +2158,29 @@ static int TestExtraField(__G__ ef, ef_len)
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}
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break;
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case EF_PKVMS:
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- if (makelong(ef+EB_HEADSIZE) !=
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- crc32(CRCVAL_INITIAL, ef+(EB_HEADSIZE+4),
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- (extent)(ebLen-4)))
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- Info(slide, 1, ((char *)slide,
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- LoadFarString(BadCRC_EAs)));
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+ /* 2015-01-30 SMS. Added sufficient-bytes test/message
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+ * here. (Removed defective ebLen test above.)
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+ *
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+ * If sufficient bytes (EB_PKVMS_MINLEN) are available,
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+ * then compare the stored CRC value with the calculated
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+ * CRC for the remainder of the data (and complain about
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+ * a mismatch).
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+ */
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+ if (ebLen < EB_PKVMS_MINLEN)
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+ {
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+ /* Insufficient bytes available. */
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+ Info( slide, 1,
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+ ((char *)slide, LoadFarString( TooSmallEBlength),
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+ ebLen, EB_PKVMS_MINLEN));
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+ }
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+ else if (makelong(ef+ EB_HEADSIZE) !=
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+ crc32(CRCVAL_INITIAL,
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+ (ef+ EB_HEADSIZE+ EB_PKVMS_MINLEN),
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+ (extent)(ebLen- EB_PKVMS_MINLEN)))
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+ {
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+ Info(slide, 1, ((char *)slide,
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+ LoadFarString(BadCRC_EAs)));
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+ }
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break;
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case EF_PKW32:
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case EF_PKUNIX:
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diff --git a/unzpriv.h b/unzpriv.h
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index 005cee0..5c83a6e 100644
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--- a/unzpriv.h
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+++ b/unzpriv.h
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@@ -1806,6 +1806,8 @@
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#define EB_NTSD_VERSION 4 /* offset of NTSD version byte */
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#define EB_NTSD_MAX_VER (0) /* maximum version # we know how to handle */
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+#define EB_PKVMS_MINLEN 4 /* minimum data length of PKVMS extra block */
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+
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#define EB_ASI_CRC32 0 /* offset of ASI Unix field's crc32 checksum */
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#define EB_ASI_MODE 4 /* offset of ASI Unix permission mode field */
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