One of my VM guest has a swapon issue: root #swapon -v -f /swap1 swapon /swap1 swapon: /swap1: found swap signature: version 1, page-size 4, same byte order swapon: /swap1: pagesize=4096, swapsize=1607467008, devsize=1607467008 swapon: /swap1: swapon failed: Invalid argument
and bisection report commit 822bca52ee7e "mm/swapfile.c: fix potential memory leak in sys_swapon" cause the trouble. Go through the context I found the exit_swap_address_space(p->type) shouldn't be used in good result path. So just move it to error path. Fixes: 822bca52ee7e ("mm/swapfile.c: fix potential memory leak in sys_swapon") Signed-off-by: Alex Shi <alex....@linux.alibaba.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: "Darrick J. Wong" <darrick.w...@oracle.com> Cc: Miaohe Lin <linmia...@huawei.com> Cc: Hugh Dickins <hu...@google.com> Cc: linux...@kvack.org Cc: linux-kernel@vger.kernel.org --- mm/swapfile.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index c8966b8fc6ac..1ac1f737fee3 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -3339,7 +3339,8 @@ static bool swap_discardable(struct swap_info_struct *si) error = inode_drain_writes(inode); if (error) { inode->i_flags &= ~S_SWAPFILE; - goto free_swap_address_space; + exit_swap_address_space(p->type); + goto bad_swap_unlock_inode; } mutex_lock(&swapon_mutex); @@ -3364,8 +3365,6 @@ static bool swap_discardable(struct swap_info_struct *si) error = 0; goto out; -free_swap_address_space: - exit_swap_address_space(p->type); bad_swap_unlock_inode: inode_unlock(inode); bad_swap: -- 1.8.3.1