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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1753703523; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=pVtIasSIO1whlGH6OE9X6z7Twiezig7uP2gbURPfn8Q=; b=MZ1a5UYN2gLrpeK2w/1v26QpHpxgs6sioMgdMAohjvBTMz5u42A4QB5z2wNyiI8KgnyJOr oywLJoqILEFkx7S0KlpjEvRPnlA3Kn9ZG5FnOGX14o41una8FdpFIbZqJE/8QKtTWPYiHD SeagegBqN9jgyl8gRfRPaB7kXADK0bI= X-MC-Unique: WsTdgRSRMAmxFpUv9oLQIA-1 X-Mimecast-MFC-AGG-ID: WsTdgRSRMAmxFpUv9oLQIA_1753703517 From: Thomas Huth To: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , qemu-devel@nongnu.org Cc: Aurelien Jarno , Jiaxun Yang , qemu-trivial@nongnu.org Subject: [PATCH] hw/mips/malta: Silence warning from ubsan Date: Mon, 28 Jul 2025 13:51:51 +0200 Message-ID: <20250728115152.187728-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" From: Thomas Huth When compiling QEMU with --enable-ubsan there is a undefined behavior warning when using the malta machine: hw/mips/malta.c:1200:32: runtime error: addition of unsigned offset to 0x7fb620600000 overflowed to 0x7fb6205fffff SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior hw/mips/malta.c:12= 00:32 To fix the issue, check the bios_size whether we really loaded the firmware before trying to byte-swap the instructions here. Signed-off-by: Thomas Huth Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- hw/mips/malta.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/mips/malta.c b/hw/mips/malta.c index cbdbb210568..47dd4016cfd 100644 --- a/hw/mips/malta.c +++ b/hw/mips/malta.c @@ -1190,7 +1190,7 @@ void mips_malta_init(MachineState *machine) * In little endian mode the 32bit words in the bios are swapped, * a neat trick which allows bi-endian firmware. */ - if (!TARGET_BIG_ENDIAN) { + if (!TARGET_BIG_ENDIAN && bios_size > 0) { uint32_t *end, *addr; const size_t swapsize =3D MIN(bios_size, 0x3e0000); addr =3D rom_ptr(FLASH_ADDRESS, swapsize); --=20 2.50.1