linux-kernel - [PATCH] pstore: do not use message compression without lock

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Message-ID: <20150421113209.24606.17013.stgit@buzz>
Date:	Tue, 21 Apr 2015 14:32:09 +0300
From:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:	Tony Luck <tony.luck@...el.com>,
	Anton Vorontsov <anton@...msg.org>,
	linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
	Colin Cross <ccross@...roid.com>
Subject: [PATCH] pstore: do not use message compression without lock

pstore_compress() uses static stream buffer for zlib-deflate which
easily crashes when several concurrent threads use one shared state.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
---
 fs/pstore/platform.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index c4c9a10c5760..de525ec0b490 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -299,7 +299,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
 		bool compressed;
 		size_t total_len;
 
-		if (big_oops_buf) {
+		if (big_oops_buf && is_locked) {
 			dst = big_oops_buf;
 			hsize = sprintf(dst, "%s#%d Part%u\n", why,
 							oopscount, part);

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