JFFS2: add missing verify buffer allocation/deallocation

commit bc8cec0dff072f1a45ce7f6b2c5234bb3411ac51 upstream.

The function jffs2_nor_wbuf_flash_setup() doesn't allocate the verify buffer
if CONFIG_JFFS2_FS_WBUF_VERIFY is defined, so causing a kernel panic when
that macro is enabled and the verify function is called. Similarly the
jffs2_nor_wbuf_flash_cleanup() must free the buffer if
CONFIG_JFFS2_FS_WBUF_VERIFY is enabled.
The following patch fixes the problem.
The following patch applies to 2.6.30 kernel.

Signed-off-by: Massimo Cirillo <maxcir@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 0e78b00035e47a313ba43bafba87dfffbe9cf1b4..4d89e5f3e04f6d1b1bd8927b0a229d25793530e0 100644 (file)
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -1271,10 +1271,20 @@ int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c) {
        if (!c->wbuf)
                return -ENOMEM;
 
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+       c->wbuf_verify = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
+       if (!c->wbuf_verify) {
+               kfree(c->wbuf);
+               return -ENOMEM;
+       }
+#endif
        return 0;
 }
 
 void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c) {
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+       kfree(c->wbuf_verify);
+#endif
        kfree(c->wbuf);
 }