From: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Date: Fri, 7 Nov 2008 00:08:19 +0000 (+0000)
Subject: JFFS2: fix race condition in jffs2_lzo_compress()
X-Git-Tag: v2.6.27.6~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a414c208c07d29b404d07665ea6ab1bc564ade42;p=pandora-kernel.git

JFFS2: fix race condition in jffs2_lzo_compress()

commit dc8a0843a435b2c0891e7eaea64faaf1ebec9b11 upstream

deflate_mutex protects the globals lzo_mem and lzo_compress_buf.  However,
jffs2_lzo_compress() unlocks deflate_mutex _before_ it has copied out the
compressed data from lzo_compress_buf.  Correct this by moving the mutex
unlock after the copy.

In addition, document what deflate_mutex actually protects.

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Acked-by: Richard Purdie <rpurdie@openedhand.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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