File CVE-2016-10349.patch of Package libarchive.9088
commit 88eb9e1d73fef46f04677c25b1697b8e25777ed3
Author: Joerg Sonnenberger <joerg@bec.de>
Date: Thu Dec 1 19:56:43 2016 +0100
Reread the CAB header skipping the self-extracting binary code.
Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15 as found
by the "OSS-Fuzz" project.
diff --git a/libarchive/archive_read_support_format_cab.c b/libarchive/archive_read_support_format_cab.c
index fc70684a..099f4a83 100644
--- a/libarchive/archive_read_support_format_cab.c
+++ b/libarchive/archive_read_support_format_cab.c
@@ -645,12 +645,13 @@ cab_read_header(struct archive_read *a)
cab = (struct cab *)(a->format->data);
if (cab->found_header == 0 &&
p[0] == 'M' && p[1] == 'Z') {
- /* This is an executable? Must be self-extracting... */
+ /* This is an executable? Must be self-extracting... */
err = cab_skip_sfx(a);
if (err < ARCHIVE_WARN)
return (err);
- if ((p = __archive_read_ahead(a, sizeof(*p), NULL)) == NULL)
+ /* Re-read header after processing the SFX. */
+ if ((p = __archive_read_ahead(a, 42, NULL)) == NULL)
return (truncated_error(a));
}