62 lines
2.2 KiB
Diff
62 lines
2.2 KiB
Diff
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Fix CVE-2017-5976:
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5976
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Patch copied from Debian.
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Index: zziplib-0.13.62/zzip/memdisk.c
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===================================================================
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--- zziplib-0.13.62.orig/zzip/memdisk.c
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+++ zziplib-0.13.62/zzip/memdisk.c
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@@ -201,6 +201,7 @@ zzip_mem_entry_new(ZZIP_DISK * disk, ZZI
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{
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void *mem = malloc(ext1 + 2);
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item->zz_ext[1] = mem;
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+ item->zz_extlen[1] = ext1 + 2;
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memcpy(mem, ptr1, ext1);
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((char *) (mem))[ext1 + 0] = 0;
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((char *) (mem))[ext1 + 1] = 0;
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@@ -209,6 +210,7 @@ zzip_mem_entry_new(ZZIP_DISK * disk, ZZI
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{
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void *mem = malloc(ext2 + 2);
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item->zz_ext[2] = mem;
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+ item->zz_extlen[2] = ext2 + 2;
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memcpy(mem, ptr2, ext2);
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((char *) (mem))[ext2 + 0] = 0;
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((char *) (mem))[ext2 + 1] = 0;
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@@ -245,8 +247,10 @@ zzip_mem_entry_extra_block(ZZIP_MEM_ENTR
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while (1)
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{
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ZZIP_EXTRA_BLOCK *ext = entry->zz_ext[i];
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- if (ext)
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+ if (ext && (entry->zz_extlen[i] >= zzip_extra_block_headerlength))
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{
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+ char *endblock = (char *)ext + entry->zz_extlen[i];
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+
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while (*(short *) (ext->z_datatype))
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{
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if (datatype == zzip_extra_block_get_datatype(ext))
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@@ -257,6 +261,10 @@ zzip_mem_entry_extra_block(ZZIP_MEM_ENTR
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e += zzip_extra_block_headerlength;
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e += zzip_extra_block_get_datasize(ext);
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ext = (void *) e;
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+ if (e >= endblock)
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+ {
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+ break;
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+ }
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____;
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}
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}
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Index: zziplib-0.13.62/zzip/memdisk.h
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===================================================================
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--- zziplib-0.13.62.orig/zzip/memdisk.h
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+++ zziplib-0.13.62/zzip/memdisk.h
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@@ -66,6 +66,7 @@ struct _zzip_mem_entry {
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int zz_filetype; /* (from "z_filetype") */
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char* zz_comment; /* zero-terminated (from "comment") */
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ZZIP_EXTRA_BLOCK* zz_ext[3]; /* terminated by null in z_datatype */
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+ int zz_extlen[3]; /* length of zz_ext[i] in bytes */
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}; /* the extra blocks are NOT converted */
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#define _zzip_mem_disk_findfirst(_d_) ((_d_)->list)
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