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Thu, 02 May 2024 08:22:44 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGFOwVxoLUnKbi2kbsFsMq0YgXnwuUQWhXBSV0+eHaOOwTRjCQ370wGAVv89gefF1D5pyZb+A== X-Received: by 2002:a17:906:2ad2:b0:a52:6fcb:564a with SMTP id m18-20020a1709062ad200b00a526fcb564amr3848934eje.9.1714663363599; Thu, 02 May 2024 08:22:43 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: qemu-trivial@nongnu.org, Roman Kiryanov , Daniel Berrange Subject: [PATCH v2] bitmap: Use g_try_new0/g_renew Date: Thu, 2 May 2024 17:22:42 +0200 Message-ID: <20240502152242.101181-1-pbonzini@redhat.com> X-Mailer: git-send-email 2.44.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.476, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1714663415647100003 Content-Type: text/plain; charset="utf-8" Avoids an explicit use of sizeof(). The GLib allocation macros ensure that the multiplication by the size of the element uses the right type and does not overflow. While at it, change bitmap_new() to use g_new0 directly. Its current impl of calling bitmap_try_new() followed by a plain abort() has worse diagnostics than g_new0, which uses g_error to report the actual allocation size that failed. Cc: qemu-trivial@nongnu.org Cc: Roman Kiryanov Cc: Daniel Berrange Signed-off-by: Paolo Bonzini Reviewed-by: Daniel P. Berrang=C3=A9 --- include/qemu/bitmap.h | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-) diff --git a/include/qemu/bitmap.h b/include/qemu/bitmap.h index 97806811eeb..1cf288445f3 100644 --- a/include/qemu/bitmap.h +++ b/include/qemu/bitmap.h @@ -92,17 +92,14 @@ long slow_bitmap_count_one(const unsigned long *bitmap,= long nbits); =20 static inline unsigned long *bitmap_try_new(long nbits) { - long len =3D BITS_TO_LONGS(nbits) * sizeof(unsigned long); - return g_try_malloc0(len); + long nelem =3D BITS_TO_LONGS(nbits); + return g_try_new0(unsigned long, nelem); } =20 static inline unsigned long *bitmap_new(long nbits) { - unsigned long *ptr =3D bitmap_try_new(nbits); - if (ptr =3D=3D NULL) { - abort(); - } - return ptr; + long nelem =3D BITS_TO_LONGS(nbits); + return g_new0(unsigned long, nelem); } =20 static inline void bitmap_zero(unsigned long *dst, long nbits) @@ -265,10 +262,10 @@ unsigned long bitmap_find_next_zero_area(unsigned lon= g *map, static inline unsigned long *bitmap_zero_extend(unsigned long *old, long old_nbits, long new_n= bits) { - long new_len =3D BITS_TO_LONGS(new_nbits) * sizeof(unsigned long); - unsigned long *new =3D g_realloc(old, new_len); - bitmap_clear(new, old_nbits, new_nbits - old_nbits); - return new; + long new_nelem =3D BITS_TO_LONGS(new_nbits); + unsigned long *ptr =3D g_renew(unsigned long, old, new_nelem); + bitmap_clear(ptr, old_nbits, new_nbits - old_nbits); + return ptr; } =20 void bitmap_to_le(unsigned long *dst, const unsigned long *src, --=20 2.44.0