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[211.75.139.218]) by smtp.gmail.com with ESMTPSA id b26-20020aa7811a000000b00666b3706be6sm6632178pfi.107.2023.06.28.01.52.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Jun 2023 01:52:56 -0700 (PDT) From: Koba Ko To: Borislav Petkov , Tony Luck , James Morse , Mauro Carvalho Chehab , Robert Richter , linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] EDAC/i10nm: shift exponent is negative Date: Wed, 28 Jun 2023 16:52:53 +0800 Message-Id: <20230628085253.1013799-1-koba.ko@canonical.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" UBSAN complains this error ~~~ UBSAN: shift-out-of-bounds in drivers/edac/skx_common.c:369:16 shift exponent -66 is negative Call Trace: dump_stack_lvl+0x48/0x70 dump_stack+0x10/0x20 __ubsan_handle_shift_out_of_bounds+0x1ac/0x360 skx_get_dimm_info.cold+0x91/0x175 [i10nm_edac] ? kvasprintf_const+0x2a/0xb0 i10nm_get_dimm_config+0x23c/0x340 [i10nm_edac] skx_register_mci+0x139/0x1e0 [i10nm_edac] ? __pfx_i10nm_get_dimm_config+0x10/0x10 [i10nm_edac] i10nm_init+0x403/0xd10 [i10nm_edac] ? __pfx_i10nm_init+0x10/0x10 [i10nm_edac] do_one_initcall+0x5b/0x250 do_init_module+0x68/0x260 load_module+0xb45/0xcd0 ? kernel_read_file+0x2a4/0x320 __do_sys_finit_module+0xc4/0x140 ? __do_sys_finit_module+0xc4/0x140 __x64_sys_finit_module+0x18/0x30 do_syscall_64+0x58/0x90 ? syscall_exit_to_user_mode+0x29/0x50 ? do_syscall_64+0x67/0x90 ? syscall_exit_to_user_mode+0x29/0x50 ? do_syscall_64+0x67/0x90 ? do_syscall_64+0x67/0x90 ? __flush_smp_call_function_queue+0x122/0x1f0 ? exit_to_user_mode_prepare+0x30/0xb0 ? irqentry_exit_to_user_mode+0x9/0x20 ? irqentry_exit+0x43/0x50 ? sysvec_call_function+0x4b/0xd0 entry_SYSCALL_64_after_hwframe+0x72/0xdc ~~~ when get rows, cols and ranks, the returned error value doesn't be handled. check the return value is EINVAL, if yes, directly return 0. Signed-off-by: Koba Ko --- drivers/edac/skx_common.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/edac/skx_common.c b/drivers/edac/skx_common.c index 2a00e0503f0d5..98baed1617c9f 100644 --- a/drivers/edac/skx_common.c +++ b/drivers/edac/skx_common.c @@ -351,6 +351,8 @@ int skx_get_dimm_info(u32 mtr, u32 mcmtr, u32 amap, str= uct dimm_info *dimm, ranks =3D numrank(mtr); rows =3D numrow(mtr); cols =3D imc->hbm_mc ? 6 : numcol(mtr); + if (ranks =3D=3D -EINVAL || rows =3D=3D -EINVAL || cols =3D=3D -EINVAL) + return 0; =20 if (imc->hbm_mc) { banks =3D 32; --=20 2.34.1