Re: [syzbot] [ntfs3?] KASAN: slab-use-after-free Read in chrdev_open

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

fs/open.c:955:23: error: call to undeclared function 'real_mount'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
fs/open.c:955:17: error: incompatible integer to pointer conversion initializing 'struct mount *' with an expression of type 'int' [-Wint-conversion]
fs/open.c:957:10: error: incomplete definition of type 'struct mount'
fs/open.c:959:7: error: call to undeclared function 'mnt_get_count'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]


Tested on:

commit:         83a7eefe Linux 6.10-rc3
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel config:  https://syzkaller.appspot.com/x/.config?x=5a05c230e142f2bc
dashboard link: https://syzkaller.appspot.com/bug?extid=5d34cc6474499a5ff516
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14863bca980000