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Throw ArchiveException instead of EOFException when CPIO namesize <= 0 #771

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Merged
garydgregory merged 1 commit into from
Apr 28, 2026
+28 −1
Merged

Throw ArchiveException instead of EOFException when CPIO namesize <= 0 #771

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2 changes: 1 addition & 1 deletion src/main/java/org/apache/commons/compress/archivers/cpio/CpioArchiveInputStream.java
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Original file line number Diff line number Diff line change
Expand Up @@ -463,7 +463,7 @@ private CpioArchiveEntry readNewEntry(final boolean hasCrc) throws IOException {
newEntry.setRemoteDeviceMaj(readAsciiLong(8, 16));
newEntry.setRemoteDeviceMin(readAsciiLong(8, 16));
final long namesize = readAsciiLong(8, 16);
if (namesize < 0) {
if (namesize <= 0) {
throw new ArchiveException("Found illegal entry with negative name length");
}
newEntry.setChksum(readAsciiLong(8, 16));
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27 changes: 27 additions & 0 deletions src/test/java/org/apache/commons/compress/archivers/cpio/CpioArchiveInputStreamTest.java
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Expand Up @@ -93,6 +93,33 @@ void testCrcVerification() throws Exception {
}
}

@Test
void testEndOfFileInEntry_c_namesize_0x00000000() throws Exception {
// CPIO header with c_namesize = 0x00000000
// @formatter:off
final String header =
"070701" + // c_magic
"00000000" + // c_ino
"000081A4" + // c_mode
"00000000" + // c_uid
"00000000" + // c_gid
"00000001" + // c_nlink
"00000000" + // c_mtime
"00000000" + // c_filesize
"00000000" + // c_devmajor
"00000000" + // c_devminor
"00000000" + // c_rdevmajor
"00000000" + // c_rdevminor
"00000000" + // c_namesize
"00000000"; // c_check
// @formatter:on
final byte[] data = new byte[header.getBytes(StandardCharsets.US_ASCII).length + 1];
System.arraycopy(header.getBytes(), 0, data, 0, header.getBytes().length);
try (CpioArchiveInputStream cpio = CpioArchiveInputStream.builder().setByteArray(data).get()) {
assertThrows(ArchiveException.class, () -> cpio.getNextEntry());
}
}

@Test
void testEndOfFileInEntry_c_namesize_0xFFFFFFFF() throws Exception {
// CPIO header with c_namesize = 0xFFFFFFFF
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