September maintainer omnibus (tests, gdbstub, plugins)

[PATCH 24/31] contrib/plugins: fix coverity warning in cache

Alex Bennée posted 31 patches 2 years, 4 months 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 <lvivier@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Alexandre Iooss <erdnaxe@crans.org>, Mahmoud Mandour <ma.mandourr@gmail.com>, Eduardo Habkost <eduardo@habkost.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Yanan Wang <wangyanan55@huawei.com>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, John Snow <jsnow@redhat.com>, Cleber Rosa <crosa@redhat.com>, Peter Maydell <peter.maydell@linaro.org>, Song Gao <gaosong@loongson.cn>, Xiaojuan Yang <yangxiaojuan@loongson.cn>, Nicholas Piggin <npiggin@gmail.com>, Daniel Henrique Barboza <danielhb413@gmail.com>, "Cédric Le Goater" <clg@kaod.org>, Palmer Dabbelt <palmer@dabbelt.com>, Alistair Francis <alistair.francis@wdc.com>, Bin Meng <bin.meng@windriver.com>, Weiwei Li <liweiwei@iscas.ac.cn>, Liu Zhiwei <zhiwei_liu@linux.alibaba.com>, David Hildenbrand <david@redhat.com>, Ilya Leoshkevich <iii@linux.ibm.com>, Yoshinori Sato <ysato@users.sourceforge.jp>, Bastian Koppelmann <kbastian@mail.uni-paderborn.de>, Radoslaw Biernacki <rad@semihalf.com>, Leif Lindholm <quic_llindhol@quicinc.com>, Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>

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[PATCH 24/31] contrib/plugins: fix coverity warning in cache

Posted by Alex Bennée 2 years, 4 months ago

Coverity complains that appends_stats_line can be fed a 0 leading
to the undefined behaviour of a divide by 0.

Fixes: CID 1519044
Fixes: CID 1519047
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 contrib/plugins/cache.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/contrib/plugins/cache.c b/contrib/plugins/cache.c
index 4fca3edd07..9e7ade3b37 100644
--- a/contrib/plugins/cache.c
+++ b/contrib/plugins/cache.c
@@ -535,15 +535,13 @@ static void caches_free(Cache **caches)
     }
 }
 
-static void append_stats_line(GString *line, uint64_t l1_daccess,
-                              uint64_t l1_dmisses, uint64_t l1_iaccess,
-                              uint64_t l1_imisses,  uint64_t l2_access,
-                              uint64_t l2_misses)
+static void append_stats_line(GString *line,
+                              uint64_t l1_daccess, uint64_t l1_dmisses,
+                              uint64_t l1_iaccess, uint64_t l1_imisses,
+                              uint64_t l2_access, uint64_t l2_misses)
 {
-    double l1_dmiss_rate, l1_imiss_rate, l2_miss_rate;
-
-    l1_dmiss_rate = ((double) l1_dmisses) / (l1_daccess) * 100.0;
-    l1_imiss_rate = ((double) l1_imisses) / (l1_iaccess) * 100.0;
+    double l1_dmiss_rate = ((double) l1_dmisses) / (l1_daccess) * 100.0;
+    double l1_imiss_rate = ((double) l1_imisses) / (l1_iaccess) * 100.0;
 
     g_string_append_printf(line, "%-14" PRIu64 " %-12" PRIu64 " %9.4lf%%"
                            "  %-14" PRIu64 " %-12" PRIu64 " %9.4lf%%",
@@ -554,8 +552,8 @@ static void append_stats_line(GString *line, uint64_t l1_daccess,
                            l1_imisses,
                            l1_iaccess ? l1_imiss_rate : 0.0);
 
-    if (use_l2) {
-        l2_miss_rate =  ((double) l2_misses) / (l2_access) * 100.0;
+    if (l2_access && l2_misses) {
+        double l2_miss_rate =  ((double) l2_misses) / (l2_access) * 100.0;
         g_string_append_printf(line,
                                "  %-12" PRIu64 " %-11" PRIu64 " %10.4lf%%",
                                l2_access,
-- 
2.39.2