Merge pull request #3093 from stoeckmann/lz4_skip

lz4: Improve truncated input stream detection

Makefile.am

@@ -472,6 +472,7 @@ libarchive_test_SOURCES= \
 	libarchive/test/test_read_filter_grzip.c \
 	libarchive/test/test_read_filter_gzip_recursive.c \
 	libarchive/test/test_read_filter_lrzip.c \
+	libarchive/test/test_read_filter_lz4_raw.c \
 	libarchive/test/test_read_filter_lzop.c \
 	libarchive/test/test_read_filter_lzop_multiple_parts.c \
 	libarchive/test/test_read_filter_program.c \
@@ -826,6 +827,7 @@ libarchive_test_EXTRA_DIST=\
 	libarchive/test/test_read_filter_grzip.tar.grz.uu \
 	libarchive/test/test_read_filter_gzip_recursive.gz.uu \
 	libarchive/test/test_read_filter_lrzip.tar.lrz.uu \
+	libarchive/test/test_read_filter_lz4_raw_skip.uu \
 	libarchive/test/test_read_filter_lzop.tar.lzo.uu \
 	libarchive/test/test_read_filter_lzop_multiple_parts.tar.lzo.uu \
 	libarchive/test/test_read_filter_uudecode_raw.uu \

libarchive/archive_read_support_filter_lz4.c

@@ -407,9 +407,15 @@ lz4_filter_read(struct archive_read_filter *self, const void **p)
 				    "Malformed lz4 data");
 				return (ARCHIVE_FATAL);
 			}
-			uint32_t skip_bytes = archive_le32dec(read_buf);
-			__archive_read_filter_consume(self->upstream,
-				4 + skip_bytes);
+			int64_t skip_bytes = archive_le32dec(read_buf);
+			if (__archive_read_filter_consume(self->upstream,
+			    4 + skip_bytes) < 0) {
+				archive_set_error(
+				    &self->archive->archive,
+				    ARCHIVE_ERRNO_MISC,
+				    "Malformed lz4 data");
+				return (ARCHIVE_FATAL);
+			}
 		} else {
 			/* Ignore following unrecognized data. */
 			state->eof = 1;

libarchive/test/CMakeLists.txt

@@ -104,6 +104,7 @@ IF(ENABLE_TEST)
     test_read_filter_grzip.c
     test_read_filter_gzip_recursive.c
     test_read_filter_lrzip.c
+    test_read_filter_lz4_raw.c
     test_read_filter_lzop.c
     test_read_filter_lzop_multiple_parts.c
     test_read_filter_program.c

libarchive/test/test_read_filter_lz4_raw.c

@@ -0,0 +1,40 @@
+/*-
+ * Copyright (c) 2026 Tobias Stoeckmann
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "test.h"
+
+DEFINE_TEST(test_read_filter_lz4_raw_skip)
+{
+	struct archive *a;
+
+	const char *name = "test_read_filter_lz4_raw_skip";
+
+	assert((a = archive_read_new()) != NULL);
+	assertEqualIntA(a, ARCHIVE_OK, archive_read_support_filter_all(a));
+	assertEqualIntA(a, ARCHIVE_OK, archive_read_support_format_raw(a));
+	extract_reference_file(name);
+	assertEqualIntA(a, ARCHIVE_FATAL,
+	    archive_read_open_filename(a, name, 200));
+	assertEqualInt(ARCHIVE_OK, archive_read_free(a));
+}

libarchive/test/test_read_filter_lz4_raw_skip.uu

@@ -0,0 +1,4 @@
+begin 644 test_read_filter_lz4_raw_skip.uu
+<!")-&&1`IP$``(`*`````%+3R8%0*DT8_/___P``
+`
+end