b75650d84d
The output buffer size must not be reset by the gzip decoder or there is a risk of overflowing memory during decompression. Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Simon Glass <sjg@chromium.org>
105 lines
2.1 KiB
C
105 lines
2.1 KiB
C
/*
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* (C) Copyright 2000-2006
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <command.h>
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#include <image.h>
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#include <malloc.h>
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#include <u-boot/zlib.h>
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#define ZALLOC_ALIGNMENT 16
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#define HEAD_CRC 2
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#define EXTRA_FIELD 4
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#define ORIG_NAME 8
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#define COMMENT 0x10
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#define RESERVED 0xe0
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#define DEFLATED 8
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void *gzalloc(void *x, unsigned items, unsigned size)
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{
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void *p;
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size *= items;
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size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
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p = malloc (size);
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return (p);
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}
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void gzfree(void *x, void *addr, unsigned nb)
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{
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free (addr);
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}
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int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
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{
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int i, flags;
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/* skip header */
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i = 10;
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flags = src[3];
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if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
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puts ("Error: Bad gzipped data\n");
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return (-1);
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}
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if ((flags & EXTRA_FIELD) != 0)
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i = 12 + src[10] + (src[11] << 8);
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if ((flags & ORIG_NAME) != 0)
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while (src[i++] != 0)
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;
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if ((flags & COMMENT) != 0)
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while (src[i++] != 0)
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;
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if ((flags & HEAD_CRC) != 0)
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i += 2;
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if (i >= *lenp) {
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puts ("Error: gunzip out of data in header\n");
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return (-1);
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}
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return zunzip(dst, dstlen, src, lenp, 1, i);
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}
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/*
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* Uncompress blocks compressed with zlib without headers
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*/
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int zunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp,
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int stoponerr, int offset)
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{
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z_stream s;
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int r;
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s.zalloc = gzalloc;
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s.zfree = gzfree;
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r = inflateInit2(&s, -MAX_WBITS);
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if (r != Z_OK) {
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printf ("Error: inflateInit2() returned %d\n", r);
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return -1;
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}
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s.next_in = src + offset;
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s.avail_in = *lenp - offset;
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s.next_out = dst;
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s.avail_out = dstlen;
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do {
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r = inflate(&s, Z_FINISH);
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if (stoponerr == 1 && r != Z_STREAM_END &&
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(s.avail_out == 0 || r != Z_BUF_ERROR)) {
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printf("Error: inflate() returned %d\n", r);
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inflateEnd(&s);
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return -1;
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}
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s.avail_in = *lenp - offset - (int)(s.next_out - (unsigned char*)dst);
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} while (r == Z_BUF_ERROR);
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*lenp = s.next_out - (unsigned char *) dst;
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inflateEnd(&s);
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return 0;
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}
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