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authorLinus Torvalds <torvalds@linux-foundation.org>2021-07-01 21:06:39 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2021-07-01 21:06:39 +0200
commit911a2997a5b7c16b27dfe83d8e2f614e44d90f74 (patch)
treefdad1abbe9909f8faf703c4fe27f794085d34730 /fs/fs-writeback.c
parentMerge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/t... (diff)
parentwriteback: fix obtain a reference to a freeing memcg css (diff)
downloadlinux-911a2997a5b7c16b27dfe83d8e2f614e44d90f74.tar.xz
linux-911a2997a5b7c16b27dfe83d8e2f614e44d90f74.zip
Merge tag 'fs_for_v5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
Pull misc fs updates from Jan Kara: "The new quotactl_fd() syscall (remake of quotactl_path() syscall that got introduced & disabled in 5.13 cycle), and couple of udf, reiserfs, isofs, and writeback fixes and cleanups" * tag 'fs_for_v5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: writeback: fix obtain a reference to a freeing memcg css quota: remove unnecessary oom message isofs: remove redundant continue statement quota: Wire up quotactl_fd syscall quota: Change quotactl_path() systcall to an fd-based one reiserfs: Remove unneed check in reiserfs_write_full_page() udf: Fix NULL pointer dereference in udf_symlink function reiserfs: add check for invalid 1st journal block
Diffstat (limited to 'fs/fs-writeback.c')
-rw-r--r--fs/fs-writeback.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 8c7e9e51a398..06d04a74ab6c 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -567,9 +567,14 @@ static void inode_switch_wbs(struct inode *inode, int new_wb_id)
/* find and pin the new wb */
rcu_read_lock();
memcg_css = css_from_id(new_wb_id, &memory_cgrp_subsys);
- if (memcg_css)
- isw->new_wb = wb_get_create(bdi, memcg_css, GFP_ATOMIC);
+ if (memcg_css && !css_tryget(memcg_css))
+ memcg_css = NULL;
rcu_read_unlock();
+ if (!memcg_css)
+ goto out_free;
+
+ isw->new_wb = wb_get_create(bdi, memcg_css, GFP_ATOMIC);
+ css_put(memcg_css);
if (!isw->new_wb)
goto out_free;