linux-kernel - [PATCH RESEND] pstore: fix NULL pointer dereference in console writes

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Message-Id: <1352893793-25260-1-git-send-email-colin.king@canonical.com>
Date:	Wed, 14 Nov 2012 11:49:53 +0000
From:	Colin King <colin.king@...onical.com>
To:	Anton Vorontsov <cbouatmailru@...il.com>,
	Colin Cross <ccross@...roid.com>,
	Tony Luck <tony.luck@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org
Subject: [PATCH RESEND] pstore: fix NULL pointer dereference in console writes

From: Colin Ian King <colin.king@...onical.com>

Passing a NULL id causes a NULL pointer deference in writers
such as erst_writer and efi_pstore_write because they expect
to update this id.  Pass a dummy id instead.

This avoids a cascade of oopses caused when the initial
pstore_console_write passes a null which in turn causes
writes to the console causing further oopses in subsequent
pstore_console_write calls.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
Acked-by: Kees Cook <keescook@...omium.org>
---
 fs/pstore/platform.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index a40da07..947fbe0 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -161,6 +161,7 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c)
 
 	while (s < e) {
 		unsigned long flags;
+		u64 id;
 
 		if (c > psinfo->bufsize)
 			c = psinfo->bufsize;
@@ -172,7 +173,7 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c)
 			spin_lock_irqsave(&psinfo->buf_lock, flags);
 		}
 		memcpy(psinfo->buf, s, c);
-		psinfo->write(PSTORE_TYPE_CONSOLE, 0, NULL, 0, c, psinfo);
+		psinfo->write(PSTORE_TYPE_CONSOLE, 0, &id, 0, c, psinfo);
 		spin_unlock_irqrestore(&psinfo->buf_lock, flags);
 		s += c;
 		c = e - s;
-- 
1.7.10.4

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