From 95bf34186577a3fc8d8b686bf6bc253a7f0d8c61 Mon Sep 17 00:00:00 2001 From: Titus Rwantare Date: Wed, 22 Mar 2023 17:55:12 +0000 Subject: [PATCH] hw/i2c: pmbus: block uninitialised string reads MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Devices models calling pmbus_send_string can't be relied upon to send a non-zero pointer. This logs an error and doesn't segfault. Reviewed-by: Patrick Venture Signed-off-by: Titus Rwantare Reviewed-by: Philippe Mathieu-Daudé Message-Id: <20230322175513.1550412-5-titusr@google.com> Signed-off-by: Philippe Mathieu-Daudé --- hw/i2c/pmbus_device.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/hw/i2c/pmbus_device.c b/hw/i2c/pmbus_device.c index c3d6046784..44fe4eddbb 100644 --- a/hw/i2c/pmbus_device.c +++ b/hw/i2c/pmbus_device.c @@ -94,6 +94,13 @@ void pmbus_send64(PMBusDevice *pmdev, uint64_t data) void pmbus_send_string(PMBusDevice *pmdev, const char *data) { + if (!data) { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: %s: uninitialised read from 0x%02x\n", + __func__, DEVICE(pmdev)->canonical_path, pmdev->code); + return; + } + size_t len = strlen(data); g_assert(len > 0); g_assert(len + pmdev->out_buf_len < SMBUS_DATA_MAX_LEN);