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Message-Id: <20201027135503.952005751@linuxfoundation.org>
Date: Tue, 27 Oct 2020 14:52:09 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Miaohe Lin <linmiaohe@...wei.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"Darrick J. Wong" <darrick.wong@...cle.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 191/408] mm/swapfile.c: fix potential memory leak in sys_swapon
From: Miaohe Lin <linmiaohe@...wei.com>
[ Upstream commit 822bca52ee7eb279acfba261a423ed7ac47d6f73 ]
If we failed to drain inode, we would forget to free the swap address
space allocated by init_swap_address_space() above.
Fixes: dc617f29dbe5 ("vfs: don't allow writes to swap files")
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Reviewed-by: Darrick J. Wong <darrick.wong@...cle.com>
Link: https://lkml.kernel.org/r/20200930101803.53884-1-linmiaohe@huawei.com
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
mm/swapfile.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/swapfile.c b/mm/swapfile.c
index cf62bdb7b3045..ff83ffe7a9108 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -3284,7 +3284,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
error = inode_drain_writes(inode);
if (error) {
inode->i_flags &= ~S_SWAPFILE;
- goto bad_swap_unlock_inode;
+ goto free_swap_address_space;
}
mutex_lock(&swapon_mutex);
@@ -3309,6 +3309,8 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
error = 0;
goto out;
+free_swap_address_space:
+ exit_swap_address_space(p->type);
bad_swap_unlock_inode:
inode_unlock(inode);
bad_swap:
--
2.25.1
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