From 971974f0a9745a5163e1c825d38da03118054ae2 Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Thu, 29 Sep 2022 11:30:34 +0200 Subject: [PATCH] dmg: warn when opening dmg images containing blocks of unknown type Signed-off-by: Kevin Wolf Signed-off-by: Claudio Fontana Reviewed-by: Richard Henderson Message-Id: <20220929093035.4231-5-cfontana@suse.de> Signed-off-by: Paolo Bonzini --- block/dmg.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/block/dmg.c b/block/dmg.c index ba8ec344d4..675e840ca5 100644 --- a/block/dmg.c +++ b/block/dmg.c @@ -254,6 +254,25 @@ static int dmg_read_mish_block(BDRVDMGState *s, DmgHeaderState *ds, for (i = s->n_chunks; i < s->n_chunks + chunk_count; i++) { s->types[i] = buff_read_uint32(buffer, offset); if (!dmg_is_known_block_type(s->types[i])) { + switch (s->types[i]) { + case UDBZ: + warn_report_once("dmg-bzip2 module is missing, accessing bzip2 " + "compressed blocks will result in I/O errors"); + break; + case ULFO: + warn_report_once("dmg-lzfse module is missing, accessing lzfse " + "compressed blocks will result in I/O errors"); + break; + case UDCM: + case UDLE: + /* Comments and last entry can be ignored without problems */ + break; + default: + warn_report_once("Image contains chunks of unknown type %x, " + "accessing them will result in I/O errors", + s->types[i]); + break; + } chunk_count--; i--; offset += 40;