linux-kernel - [PATCH 1/3] befs: check return of sb_min

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Date:	Sun, 12 Jun 2016 03:57:13 +0100
From:	Luis de Bethencourt <luisbg@....samsung.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, salah.triki@....org,
	viro@...iv.linux.org.uk, hannes@...xchg.org,
	vdavydov@...tuozzo.com,
	Luis de Bethencourt <luisbg@....samsung.com>
Subject: [PATCH 1/3] befs: check return of sb_min_blocksize

Confirm sb_min_blocksize() succeeded before continuing.

Signed-off-by: Luis de Bethencourt <luisbg@....samsung.com>
---
Hi,

This is the main fix I wanted to send. I noticed other file systems check
the return of sb_min_blocksize(), it can fail so it is worth checking before
continuing.

Thanks :)
Luis

 fs/befs/linuxvfs.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
index c734f21..453bb68 100644
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
@@ -756,6 +756,7 @@ befs_fill_super(struct super_block *sb, void *data, int silent)
 	long ret = -EINVAL;
 	const unsigned long sb_block = 0;
 	const off_t x86_sb_off = 512;
+	int blocksize;
 
 	save_mount_options(sb, data);
 
@@ -788,7 +789,11 @@ befs_fill_super(struct super_block *sb, void *data, int silent)
 	 * least 1k to get the second 512 bytes of the volume.
 	 * -WD 10-26-01
 	 */ 
-	sb_min_blocksize(sb, 1024);
+	blocksize = sb_min_blocksize(sb, 1024);
+	if (!blocksize) {
+		befs_error(sb, "unable to set blocksize");
+		goto unacquire_priv_sbp;
+	}
 
 	if (!(bh = sb_bread(sb, sb_block))) {
 		if (!silent)
-- 
2.5.1