[PATCH] fix sys_swapon() error handling in 2.5.2-dj6

[Andrey Panin]

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Hi all,

error path in sys_swapon() can pass negative error code to filp_close()=20
which generates an oops, oneliner patch attached.

Best regards.

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Andrey Panin            | Embedded systems software engineer
[e-mail]        | PGP key: wwwkeys.eu.pgp.net
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diff -urN -X /usr/dontdiff /linux.vanilla/mm/swapfile.c /linux/mm/swapfile.c
--- /linux.vanilla/mm/swapfile.c	Wed Jan 30 01:07:49 2002
+++ /linux/mm/swapfile.c	Tue Jan 29 21:23:46 2002
@@ -1073,7 +1073,7 @@
 	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)

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