Krzysztof Wilczyński 16b02eb4b9 proc: only bump parent nlink when registering directories ... proc_register() increments the parent directory's link count for every entry it registers, while remove_proc_entry() and remove_proc_subtree() decrement it only when the removed entry is a directory. Regular files thus inflate the parent's count while they exist, and leak one link permanently on every create and remove cycle. For example, /proc/bus/pci/00 with twenty-two device files and no subdirectories reports nlink 24 instead of 2, and SR-IOV VF enable and disable cycles, each creating and removing the VF config space entries under /proc/bus/pci/<bus>, inflate the link count of that directory without bound. Before commit e06689bf57 ("proc: change ->nlink under proc_subdir_lock"), the increment lived in proc_mkdir_data() and proc_create_mount_point(), and was therefore applied only to directories. Moving it into proc_register() to bring it under proc_subdir_lock dropped the S_ISDIR check. Thus, move the nlink accounting into pde_subdir_insert() and pde_erase(), only updating it for directories in both, so the link count is always changed together with the directory entry itself. Fixes: e06689bf57 ("proc: change ->nlink under proc_subdir_lock") Cc: stable@vger.kernel.org # v5.5+ Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> Link: https://patch.msgid.link/20260613211005.921692-1-kwilczynski@kernel.org Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>		2026-07-01 15:26:24 +02:00
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array.c	proc: protect ptrace_may_access() with exec_update_lock (part 1)	2026-06-05 10:00:55 +02:00
base.c	mm.git review status for mm-hotfixes-stable..mm-nonmm-stable	2026-06-21 13:20:19 -07:00
bootconfig.c
cmdline.c
consoles.c
cpuinfo.c
devices.c
fd.c	proc: protect ptrace_may_access() with exec_update_lock (FD links)	2026-06-05 10:00:55 +02:00
fd.h
generic.c	proc: only bump parent nlink when registering directories	2026-07-01 15:26:24 +02:00
inode.c	fs/proc: replace "__auto_type" with "const auto"	2025-12-08 15:32:15 -08:00
internal.h	proc: protect ptrace_may_access() with exec_update_lock (FD links)	2026-06-05 10:00:55 +02:00
interrupts.c
Kconfig
kcore.c	Convert 'alloc_obj' family to use the new default GFP_KERNEL argument	2026-02-21 17:09:51 -08:00
kmsg.c
loadavg.c
Makefile	genirq/proc: Speed up /proc/interrupts iteration	2026-05-26 16:21:15 +02:00
meminfo.c	mm.git review status for linus..mm-stable	2026-04-15 12:59:16 -07:00
namespaces.c	proc: protect ptrace_may_access() with exec_update_lock (part 1)	2026-06-05 10:00:55 +02:00
nommu.c
page.c
proc_net.c	proc: subset=pid: Show /proc/self/net only for CAP_NET_ADMIN	2026-05-11 23:13:01 +02:00
proc_sysctl.c	VFS: use wait_var_event for waiting in d_alloc_parallel()	2026-06-05 00:34:54 -04:00
proc_tty.c
root.c	proc: handle subset=pid separately in userns visibility checks	2026-05-11 23:13:02 +02:00
self.c	fs/proc: Don't lock root inode when creating "self" and "thread-self"	2026-03-06 10:24:11 +01:00
softirqs.c
stat.c	Updates for the NOHZ subsystem:	2026-06-15 13:48:52 +05:30
task_mmu.c	fs/proc/task_mmu: do not warn on seeing non-migration pmd entry	2026-06-08 18:21:32 -07:00
task_nommu.c
thread_self.c	fs/proc: Don't lock root inode when creating "self" and "thread-self"	2026-03-06 10:24:11 +01:00
uptime.c	tick/sched: Consolidate idle time fetching APIs	2026-06-02 21:27:26 +02:00
util.c
version.c
vmcore.c	mm: rename my_zero_pfn() to zero_pfn()	2026-04-05 13:53:01 -07:00