linux-kernel - [ 30/85] UBIFS: fix complaints about too small debug buffer size

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Date:	Wed, 12 Sep 2012 16:36:13 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Michael Hench <michaelhench@...il.com>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Subject: [ 30/85] UBIFS: fix complaints about too small debug buffer size

From: Greg KH <gregkh@...uxfoundation.org>

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

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

From: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>

commit 65b455b123c7e2b835a0b7148f9bae584f95000e upstream.

When debugging is enabled, we use a temporary on-stack buffer for formatting
the key strings like "(11368871, direntry, 0xcd0750)". The buffer size is
32 bytes and sometimes it is not enough to fit the key string - e.g., when
inode numbers are high. This is not fatal, but the key strings are incomplete
and UBIFS complains like this:

	UBIFS assert failed in dbg_snprintf_key at 137 (pid 1)

This is a regression caused by "515315a UBIFS: fix key printing".

Fix the issue by increasing the buffer to 48 bytes.

Reported-by: Michael Hench <michaelhench@...il.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Tested-by: Michael Hench <michaelhench@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ubifs/debug.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/ubifs/debug.h
+++ b/fs/ubifs/debug.h
@@ -170,7 +170,7 @@ struct ubifs_global_debug_info {
 #define ubifs_dbg_msg(type, fmt, ...) \
 	pr_debug("UBIFS DBG " type ": " fmt "\n", ##__VA_ARGS__)
 
-#define DBG_KEY_BUF_LEN 32
+#define DBG_KEY_BUF_LEN 48
 #define ubifs_dbg_msg_key(type, key, fmt, ...) do {                            \
 	char __tmp_key_buf[DBG_KEY_BUF_LEN];                                   \
 	pr_debug("UBIFS DBG " type ": " fmt "%s\n", ##__VA_ARGS__,             \


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