linux-kernel - [PATCH 3.14 30/33] pstore: Fix NULL pointer fault if get NULL prz in ramoops_get_next

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Message-Id: <20150203231240.313085423@linuxfoundation.org>
Date:	Tue,  3 Feb 2015 15:14:53 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Liu ShuoX <shuox.liu@...el.com>,
	Kees Cook <keescook@...omium.org>,
	Tony Luck <tony.luck@...el.com>, HuKeping <hukeping@...wei.com>
Subject: [PATCH 3.14 30/33] pstore: Fix NULL pointer fault if get NULL prz in ramoops_get_next_prz

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Liu ShuoX <shuox.liu@...el.com>

commit b0aa931fb84431394d995472d0af2a6c2b61064d upstream.

ramoops_get_next_prz get the prz according the paramters. If it get a
uninitialized prz, access its members by following persistent_ram_old_size(prz)
will cause a NULL pointer crash.
Ex: if ftrace_size is 0, fprz will be NULL.

Fix it by return NULL in advance.

Signed-off-by: Liu ShuoX <shuox.liu@...el.com>
Acked-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Tony Luck <tony.luck@...el.com>
Cc: HuKeping <hukeping@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/pstore/ram.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -125,6 +125,8 @@ ramoops_get_next_prz(struct persistent_r
 		return NULL;
 
 	prz = przs[i];
+	if (!prz)
+		return NULL;
 
 	/* Update old/shadowed buffer. */
 	if (update)


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