[PATCH] swap file missing error check

Found by Andries Brouwer a while back iirc.

[PATCH] swap file missing error check
Found by Andries Brouwer a while back iirc.
0ebd1760 · Dave Jones · 3f0501fe · 0ebd1760
Commit 0ebd1760 authored May 08, 2002 by Dave Jones
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mm/swapfile.c mm/swapfile.c +1 -1

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--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1088,7 +1088,7 @@ asmlinkage long sys_swapon(const char * specialfile, int swap_flags)
 	swap_list_unlock();
 	if (swap_map)
 		vfree(swap_map);
-	if (swap_file)
+	if (swap_file && !IS_ERR(swap_file))
 		filp_close(swap_file, NULL);
 out:
 	if (swap_header)