4.19-stable review patch. If anyone has any objections, please let me know.
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From: Jan Kara jack@suse.cz
[ Upstream commit 6a4e3363792e30177cc3965697e34ddcea8b900b ]
When add_dquot_ref() fails (usually due to IO error or ENOMEM), we want to disable quotas we are trying to enable. However dquot_disable() call was passed just the flags we are enabling so in case flags == DQUOT_USAGE_ENABLED dquot_disable() call will just fail with EINVAL instead of properly disabling quotas. Fix the problem by always passing DQUOT_LIMITS_ENABLED | DQUOT_USAGE_ENABLED to dquot_disable() in this case.
Reported-and-tested-by: Ye Bin yebin10@huawei.com Reported-by: syzbot+e633c79ceaecbf479854@syzkaller.appspotmail.com Signed-off-by: Jan Kara jack@suse.cz Message-Id: 20230605140731.2427629-2-yebin10@huawei.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/quota/dquot.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 770a2b1434856..0d3ffc727bb00 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -2407,7 +2407,8 @@ int dquot_load_quota_sb(struct super_block *sb, int type, int format_id,
error = add_dquot_ref(sb, type); if (error) - dquot_disable(sb, type, flags); + dquot_disable(sb, type, + DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
return error; out_fmt: