diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2018-05-15 18:27:29 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-06-01 15:13:46 +0200 |
| commit | 4f938cbd90e7cf3004a6877ce579a11a87a4aa33 (patch) | |
| tree | 672697abcc0d4dd6bb3a1d289951061f3dfe6ca6 | |
| parent | eeaa6715050ed3f9cbedd322220f31570a503217 (diff) | |
memfd: Avoid Coverity warning about integer overflow
Coverity complains about qemu_memfd_create() (CID 1385858) because
we calculate a bit position htsize which could be up to 63, but
then use it in "1 << htsize" which is a 32-bit integer calculation
and could push the 1 off the top of the value.
Silence the complaint bu using "1ULL"; this isn't a bug in
practice since a hugetlbsize of 4GB is not very plausible.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20180515172729.24564-1-peter.maydell@linaro.org>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | util/memfd.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/util/memfd.c b/util/memfd.c index b3ecbac19e..d248a53c3c 100644 --- a/util/memfd.c +++ b/util/memfd.c @@ -66,7 +66,7 @@ int qemu_memfd_create(const char *name, size_t size, bool hugetlb, { int htsize = hugetlbsize ? ctz64(hugetlbsize) : 0; - if (htsize && 1 << htsize != hugetlbsize) { + if (htsize && 1ULL << htsize != hugetlbsize) { error_setg(errp, "Hugepage size must be a power of 2"); return -1; } |