From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 538804570E3; Tue, 11 Aug 2026 17:12:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786468341; cv=none; b=IgQexCDWuqF5BqrPOOJIOLoJNpdvRwydG2MlWpSK1vv4Ar5QHMUHy/dvMJ8B5e8aZi7Ac70oe640EuX3+utEi0BErgyPPMOznE0MvvWW7BshZcBPBH4DcVkoRTB7G0xZKPY1BSbRup0RVbD67QBUWNFxuIOfTckeKRopE7W5iYw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786468341; c=relaxed/simple; bh=jAoDEexzBfmVbDUQRA+8xn8rzqgPgumPJ6dP0DvzSIk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=n2xfvFqFw5CcwpbixAvftVm2+ElP/WLfSrWEQU/vXTixIGu0GH1KB6niWMEb72gDiRYhfDPxK6ZEJmTv9cWZA71Ep3bbXgLnHeTz/WDGkwEujlSM0gWTvy2jk/qa6Cb6cyJ/U7M6oRmpYXdp1L9rJXzCBNVHLc24OXgeu3QX7TA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MX7/m1+Z; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MX7/m1+Z" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 737E61F000E9; Tue, 11 Aug 2026 17:12:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786468338; bh=IbhEIOSm80yDQVumaY0vuMXvC7o2n8XYqsqqUww+NlE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=MX7/m1+ZuiR+MdNdVXth2uN6bESSNYEyj6uv9XtL2b3iqKyzj/3CaPLRn6pLZ6UxI dV4tixXUy9MCOjvOSBYvbeynYw7i+kwgUuGlWgNEXdxvLsMZ0G5v2NARkEcRAvs1V0 r3sBA0uE+U7j1xYyOdaxwwzrGnu0Y/r2DRgdpV/f9LqIrorvop4pPoQ6y+O+BQsbU2 ST82slRGi2tl8/YmfcbXGRYYlb675GY0yPdyeDb35Eo/VwsvN2lzNTsu1HvQhliduo j0PsczPX6CmhCK6W9ZmW1/DHj3miwOtM8RO/hqsYL+MeRyALfpLOa8cqriafCF6Kzc lUya0JiQkMfNA== From: Arnaldo Carvalho de Melo To: Namhyung Kim Cc: Ingo Molnar , Thomas Gleixner , James Clark , Jiri Olsa , Ian Rogers , Adrian Hunter , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Arnaldo Carvalho de Melo , sashiko-bot Subject: [PATCH 2/5] perf dso: Guard close() against invalid fd in dso__decompress_kmodule_path() Date: Tue, 11 Aug 2026 14:11:57 -0300 Message-ID: <20260811171200.30096-3-acme@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260811171200.30096-1-acme@kernel.org> References: <20260811171200.30096-1-acme@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Arnaldo Carvalho de Melo dso__decompress_kmodule_path() unconditionally calls close(fd) on the return value of decompress_kmodule(). When decompression fails or the DSO is not compressed, decompress_kmodule() returns -1. close(-1) fails with EBADF and clobbers errno, which callers up the chain (dso__get_filename → __open_dso) depend on for error propagation. Guard the close() call with fd >= 0 so only valid file descriptors are closed. Fixes: 42b3fa670825 ("perf tools: Introduce dso__decompress_kmodule_{fd,path}") Reported-by: sashiko-bot Cc: Namhyung Kim Assisted-by: Claude:claude-opus-4.6 Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/dso.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c index fcd4b462992be6f2..124193453675ca18 100644 --- a/tools/perf/util/dso.c +++ b/tools/perf/util/dso.c @@ -395,7 +395,9 @@ int dso__decompress_kmodule_path(struct dso *dso, const char *name, { int fd = decompress_kmodule(dso, name, pathname, len); - close(fd); + /* decompress_kmodule() returns -1 on failure, don't close(-1) */ + if (fd >= 0) + close(fd); return fd >= 0 ? 0 : -1; } -- 2.55.0