From: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> [ Upstream commit 71448011ea2a1cd36d8f5cbdab0ed716c454d565 ] This just keeps everything tidier, and allows for using flags like SLAB_TYPESAFE_BY_RCU where slabs are not always cleared before reuse. I don't see reuse without reinitializing happening with the proc_inode but I had a false alarm while reworking flushing of proc dentries and indoes when a process dies that caused me to tidy this up. The code is a little easier to follow and reason about this way so I figured the changes might as well be kept. Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> # 4.19.x Signed-off-by: Wen Yang <wenyang@xxxxxxxxxxxxxxxxx> --- fs/proc/inode.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/fs/proc/inode.c b/fs/proc/inode.c index fffc7e4..45b4344 100644 --- a/fs/proc/inode.c +++ b/fs/proc/inode.c @@ -34,21 +34,27 @@ static void proc_evict_inode(struct inode *inode) { struct proc_dir_entry *de; struct ctl_table_header *head; + struct proc_inode *ei = PROC_I(inode); truncate_inode_pages_final(&inode->i_data); clear_inode(inode); /* Stop tracking associated processes */ - put_pid(PROC_I(inode)->pid); + if (ei->pid) { + put_pid(ei->pid); + ei->pid = NULL; + } /* Let go of any associated proc directory entry */ - de = PDE(inode); - if (de) + de = ei->pde; + if (de) { pde_put(de); + ei->pde = NULL; + } - head = PROC_I(inode)->sysctl; + head = ei->sysctl; if (head) { - RCU_INIT_POINTER(PROC_I(inode)->sysctl, NULL); + RCU_INIT_POINTER(ei->sysctl, NULL); proc_sys_evict_inode(inode, head); } } -- 1.8.3.1