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mm/swapfile.c: fix swapon frontswap_map memory leak on error

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Free frontswap_map if an error is encountered before enable_swap_info().

Signed-off-by: David Rientjes <rientjes@google.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org>	[4.12+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes 2017-09-08 16:13:29 -07:00 committed by Linus Torvalds
parent 8606a1a94d
commit b6b1fd2a6b
1 changed files with 1 additions and 0 deletions
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mm/swapfile.c
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@ -3291,6 +3291,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
spin_unlock(&swap_lock);
vfree(swap_map);
kvfree(cluster_info);
kvfree(frontswap_map);
if (swap_file) {
if (inode && S_ISREG(inode->i_mode)) {
inode_unlock(inode);