136 lines
5.1 KiB
Diff
136 lines
5.1 KiB
Diff
From RedHat: https://bugzilla.redhat.com/attachment.cgi?id=969625&action=diff
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(unzip60/ path prefix added)
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--- unzip60/process.c 2009-03-06 02:25:10.000000000 +0100
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+++ unzip60/process.c 2014-12-05 22:42:39.000000000 +0100
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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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@@ -1888,48 +1888,82 @@ int getZip64Data(__G__ ef_buf, ef_len)
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and a 4-byte version of disk start number.
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Sets both local header and central header fields. Not terribly clever,
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but it means that this procedure is only called in one place.
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+
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+ 2014-12-05 SMS.
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+ Added checks to ensure that enough data are available before calling
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+ makeint64() or makelong(). Replaced various sizeof() values with
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+ simple ("4" or "8") constants. (The Zip64 structures do not depend
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+ on our variable sizes.) Error handling is crude, but we should now
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+ stay within the buffer.
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---------------------------------------------------------------------------*/
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+#define Z64FLGS 0xffff
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+#define Z64FLGL 0xffffffff
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+
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if (ef_len == 0 || ef_buf == NULL)
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return PK_COOL;
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Trace((stderr,"\ngetZip64Data: scanning extra field of length %u\n",
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ef_len));
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- while (ef_len >= EB_HEADSIZE) {
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+ while (ef_len >= EB_HEADSIZE)
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+ {
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eb_id = makeword(EB_ID + ef_buf);
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eb_len = makeword(EB_LEN + ef_buf);
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- if (eb_len > (ef_len - EB_HEADSIZE)) {
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- /* discovered some extra field inconsistency! */
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+ if (eb_len > (ef_len - EB_HEADSIZE))
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+ {
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+ /* Extra block length exceeds remaining extra field length. */
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Trace((stderr,
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"getZip64Data: block length %u > rest ef_size %u\n", eb_len,
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ef_len - EB_HEADSIZE));
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break;
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}
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- if (eb_id == EF_PKSZ64) {
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-
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+ if (eb_id == EF_PKSZ64)
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+ {
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int offset = EB_HEADSIZE;
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- if (G.crec.ucsize == 0xffffffff || G.lrec.ucsize == 0xffffffff){
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- G.lrec.ucsize = G.crec.ucsize = makeint64(offset + ef_buf);
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- offset += sizeof(G.crec.ucsize);
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+ if ((G.crec.ucsize == Z64FLGL) || (G.lrec.ucsize == Z64FLGL))
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+ {
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+ if (offset+ 8 > ef_len)
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+ return PK_ERR;
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+
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+ G.crec.ucsize = G.lrec.ucsize = makeint64(offset + ef_buf);
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+ offset += 8;
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}
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- if (G.crec.csize == 0xffffffff || G.lrec.csize == 0xffffffff){
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- G.csize = G.lrec.csize = G.crec.csize = makeint64(offset + ef_buf);
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- offset += sizeof(G.crec.csize);
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+
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+ if ((G.crec.csize == Z64FLGL) || (G.lrec.csize == Z64FLGL))
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+ {
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+ if (offset+ 8 > ef_len)
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+ return PK_ERR;
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+
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+ G.csize = G.crec.csize = G.lrec.csize = makeint64(offset + ef_buf);
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+ offset += 8;
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}
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- if (G.crec.relative_offset_local_header == 0xffffffff){
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+
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+ if (G.crec.relative_offset_local_header == Z64FLGL)
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+ {
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+ if (offset+ 8 > ef_len)
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+ return PK_ERR;
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+
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G.crec.relative_offset_local_header = makeint64(offset + ef_buf);
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- offset += sizeof(G.crec.relative_offset_local_header);
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+ offset += 8;
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}
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- if (G.crec.disk_number_start == 0xffff){
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+
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+ if (G.crec.disk_number_start == Z64FLGS)
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+ {
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+ if (offset+ 4 > ef_len)
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+ return PK_ERR;
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+
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G.crec.disk_number_start = (zuvl_t)makelong(offset + ef_buf);
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- offset += sizeof(G.crec.disk_number_start);
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+ offset += 4;
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}
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+#if 0
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+ break; /* Expect only one EF_PKSZ64 block. */
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+#endif /* 0 */
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}
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- /* Skip this extra field block */
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+ /* Skip this extra field block. */
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ef_buf += (eb_len + EB_HEADSIZE);
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ef_len -= (eb_len + EB_HEADSIZE);
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}
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--- unzip60/fileio.c 2009-04-20 02:03:44.000000000 +0200
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+++ unzip60/fileio.c 2014-12-05 22:44:16.000000000 +0100
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@@ -176,6 +176,8 @@ static ZCONST char Far FilenameTooLongTr
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#endif
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static ZCONST char Far ExtraFieldTooLong[] =
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"warning: extra field too long (%d). Ignoring...\n";
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+static ZCONST char Far ExtraFieldCorrupt[] =
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+ "warning: extra field (type: 0x%04x) corrupt. Continuing...\n";
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#ifdef WINDLL
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static ZCONST char Far DiskFullQuery[] =
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@@ -2295,7 +2297,12 @@ int do_string(__G__ length, option) /*
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if (readbuf(__G__ (char *)G.extra_field, length) == 0)
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return PK_EOF;
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/* Looks like here is where extra fields are read */
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- getZip64Data(__G__ G.extra_field, length);
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+ if (getZip64Data(__G__ G.extra_field, length) != PK_COOL)
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+ {
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+ Info(slide, 0x401, ((char *)slide,
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+ LoadFarString( ExtraFieldCorrupt), EF_PKSZ64));
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+ error = PK_WARN;
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+ }
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#ifdef UNICODE_SUPPORT
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G.unipath_filename = NULL;
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if (G.UzO.U_flag < 2) {
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