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[PULL 04/40] hw/core: ensure kernel_end never gets used undefined

Alex Bennée posted 40 patches 4 months, 3 weeks ago

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Maintainers: "Alex Bennée" <alex.bennee@linaro.org>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Thomas Huth <thuth@redhat.com>, Wainer dos Santos Moschetta <wainersm@redhat.com>, Beraldo Leal <bleal@redhat.com>, Laurent Vivier <laurent@vivier.eu>, Paolo Bonzini <pbonzini@redhat.com>, Alexandre Iooss <erdnaxe@crans.org>, Mahmoud Mandour <ma.mandourr@gmail.com>, Pierrick Bouvier <pierrick.bouvier@linaro.org>, Eduardo Habkost <eduardo@habkost.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Yanan Wang <wangyanan55@huawei.com>, Paul Burton <paulburton@kernel.org>, Aleksandar Rikalo <arikalo@gmail.com>, Peter Xu <peterx@redhat.com>, David Hildenbrand <david@redhat.com>, Peter Maydell <peter.maydell@linaro.org>, Stefan Hajnoczi <stefanha@redhat.com>, Mads Ynddal <mads@ynddal.dk>

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[PULL 04/40] hw/core: ensure kernel_end never gets used undefined

Posted by Alex Bennée 4 months, 3 weeks ago

Really the problem here is the return values of fit_load_[kernel|fdt]() are a
little all over the place. However we don't want to somehow get
through not having set kernel_end and having it just be random unused
data.

The compiler complained on an --enable-gcov build:

  In file included from ../../hw/core/loader-fit.c:20:
  /home/alex/lsrc/qemu.git/include/qemu/osdep.h: In function ‘load_fit’:
  /home/alex/lsrc/qemu.git/include/qemu/osdep.h:486:45: error: ‘kernel_end’ may be used uninitialized [-Werror=maybe-uninitialized]
    486 | #define ROUND_UP(n, d) ROUND_DOWN((n) + (d) - 1, (d))
        |                                             ^
  ../../hw/core/loader-fit.c:270:12: note: ‘kernel_end’ was declared here
    270 |     hwaddr kernel_end;
        |            ^~~~~~~~~~

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Aleksandar Rikalo <arikalo@gmail.com>
Message-Id: <20240705084047.857176-5-alex.bennee@linaro.org>

diff --git a/hw/core/loader-fit.c b/hw/core/loader-fit.c
index 9f20007dbb..7ccc9d5fbc 100644
--- a/hw/core/loader-fit.c
+++ b/hw/core/loader-fit.c
@@ -267,7 +267,7 @@ int load_fit(const struct fit_loader *ldr, const char *filename, void *opaque)
     const char *def_cfg_name;
     char path[FIT_LOADER_MAX_PATH];
     int itb_size, configs, cfg_off, off;
-    hwaddr kernel_end;
+    hwaddr kernel_end = 0;
     int ret;
 
     itb = load_device_tree(filename, &itb_size);
-- 
2.39.2