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Thu, 12 Feb 2026 15:17:26 -0800 (PST) Message-ID: <4f2c347bec3e1192435e668f70eb70a0b3714c42.camel@gmail.com> Subject: Re: [PATCH bpf-next v1 06/14] selftests/bpf: Fix cleanup in check_fd_array_cnt__fd_array_too_big() From: Eduard Zingerman To: Ihor Solodrai , Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann Cc: Amery Hung , Mykyta Yatsenko , Alexis =?ISO-8859-1?Q?Lothor=E9?= , bpf@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com Date: Thu, 12 Feb 2026 15:17:24 -0800 In-Reply-To: <20260212011356.3266753-7-ihor.solodrai@linux.dev> References: <20260212011356.3266753-1-ihor.solodrai@linux.dev> <20260212011356.3266753-7-ihor.solodrai@linux.dev> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.1 (3.58.1-1.fc43) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2026-02-11 at 17:13 -0800, Ihor Solodrai wrote: > The Close() macro uses the passed in expression three times, which > leads to repeated execution in case it has side effects. That is, > Close(i--) would decrement i three times. >=20 > ASAN caught a stack-buffer-undeflow error at a point where this was > overlooked. Fix it. >=20 > Signed-off-by: Ihor Solodrai > --- Acked-by: Eduard Zingerman (However, in bpf headers the common pattern is to define a variable in the macro body, something like `int ___fd =3D (FD);). [...]