linux-kernel - [PATCH 1/1] fs: udf: parse

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Message-Id: <20140129171316.ad5c50a7091e67b7ff1d329b@skynet.be>
Date:	Wed, 29 Jan 2014 17:13:16 +0800
From:	Fabian Frederick <fabf@...net.be>
To:	linux-kernel@...r.kernel.org
Cc:	jack@...e.cz, akpm@...ux-foundation.org, rdunlap@...radead.org,
	viro@...iv.linux.org.uk
Subject: [PATCH 1/1] fs: udf: parse_options: blocksize check

Both affs and isofs check for blocksize integrity during
parse_options.Do the same thing for udf.

Valid values : 512, 1024, 2048 or 4096 bytes.

Signed-off-by: Fabian Frederick <fabf@...net.be>
---
 fs/udf/super.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/udf/super.c b/fs/udf/super.c
index 3306b9f..ac76538 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -505,6 +505,7 @@ static int udf_parse_options(char *options, struct udf_options *uopt,
 	while ((p = strsep(&options, ",")) != NULL) {
 		substring_t args[MAX_OPT_ARGS];
 		int token;
+		unsigned n;
 		if (!*p)
 			continue;
 
@@ -516,7 +517,10 @@ static int udf_parse_options(char *options, struct udf_options *uopt,
 		case Opt_bs:
 			if (match_int(&args[0], &option))
 				return 0;
-			uopt->blocksize = option;
+			n = option;
+			if (n != 512 && n != 1024 && n != 2048 && n != 4096)
+				return 0;
+			uopt->blocksize = n;
 			uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
 			break;
 		case Opt_unhide:
-- 
1.8.1.4

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