guix/gnu/packages/patches/libarchive-CVE-2013-0211.patch

Description: Fix CVE-2013-0211: read buffer overflow on 64-bit systems
Origin: upstream
Bug-Debian: http://bugs.debian.org/703957
Forwarded: not-needed

--- libarchive-3.0.4.orig/libarchive/archive_write.c
+++ libarchive-3.0.4/libarchive/archive_write.c
@@ -665,8 +665,13 @@ static ssize_t
 _archive_write_data(struct archive *_a, const void *buff, size_t s)
 {
 	struct archive_write *a = (struct archive_write *)_a;
+	const size_t max_write = INT_MAX;
+
 	archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_DATA, "archive_write_data");
+	/* In particular, this catches attempts to pass negative values. */
+	if (s > max_write)
+		s = max_write;
 	archive_clear_error(&a->archive);
 	return ((a->format_write_data)(a, buff, s));
 }