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Date: Tue, 25 Jan 2022 10:14:46 -0800 From: Luis Chamberlain <mcgrof@...nel.org> To: Andrew Morton <akpm@...ux-foundation.org> Cc: kernel test robot <lkp@...el.com>, Tong Zhang <ztong0001@...il.com>, Alexander Viro <viro@...iv.linux.org.uk>, Eric Biederman <ebiederm@...ssion.com>, Kees Cook <keescook@...omium.org>, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, kbuild-all@...ts.01.org, Linux Memory Management List <linux-mm@...ck.org> Subject: Re: [PATCH v1] binfmt_misc: fix crash when load/unload module On Mon, Jan 24, 2022 at 03:16:11PM -0800, Andrew Morton wrote: > On Mon, 24 Jan 2022 19:40:53 +0800 kernel test robot <lkp@...el.com> wrote: > > > Hi Tong, > > > > > > >> fs/binfmt_misc.c:828:21: error: incompatible pointer types assigning to 'struct ctl_table_header *' from 'struct sysctl_header *' [-Werror,-Wincompatible-pointer-types] > > binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc"); > > ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > 1 error generated. > > > > > > vim +828 fs/binfmt_misc.c > > > > 821 > > 822 static int __init init_misc_binfmt(void) > > 823 { > > 824 int err = register_filesystem(&bm_fs_type); > > 825 if (!err) > > 826 insert_binfmt(&misc_format); > > 827 > > > 828 binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc"); > > 829 if (!binfmt_misc_header) { > > 830 pr_warn("Failed to create fs/binfmt_misc sysctl mount point"); > > 831 return -ENOMEM; > > 832 } > > 833 return 0; > > 834 } > > 835 > > This is actually a blooper in Luis's "sysctl: add helper to register a > sysctl mount point". > > Please test, review, ridicule, etc: > > From: Andrew Morton <akpm@...ux-foundation.org> > Subject: include/linux/sysctl.h: fix register_sysctl_mount_point() return type > > The CONFIG_SYSCTL=n stub returns the wrong type. > > Fixes: ee9efac48a082 ("sysctl: add helper to register a sysctl mount point") > Cc: Luis Chamberlain <mcgrof@...nel.org> > Cc: Tong Zhang <ztong0001@...il.com> > Signed-off-by: Andrew Morton <akpm@...ux-foundation.org> Acked-by: Luis Chamberlain <mcgrof@...nel.org> Luis
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