From: Dan Carpenter <dan.carpenter@oracle.com>
To: "Theodore Ts'o" <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>,
linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: [patch] ext4: underflow in alignment check
Date: Thu, 16 Jun 2016 10:07:09 +0300 [thread overview]
Message-ID: <20160616070709.GC23129@mwanda> (raw)
My static checker complains that this can underflow if arg is negative
which is true.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index b1a3471..a2a17e9 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1576,7 +1576,7 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
} else if (token == Opt_min_batch_time) {
sbi->s_min_batch_time = arg;
} else if (token == Opt_inode_readahead_blks) {
- if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
+ if (arg && (arg > (1U << 30) || !is_power_of_2(arg))) {
ext4_msg(sb, KERN_ERR,
"EXT4-fs: inode_readahead_blks must be "
"0 or a power of 2 smaller than 2^31");
next reply other threads:[~2016-06-16 7:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-16 7:07 Dan Carpenter [this message]
2016-06-20 16:02 ` [patch] ext4: underflow in alignment check Jan Kara
2016-06-20 19:53 ` Dan Carpenter
2016-06-21 7:43 ` Jan Kara
2016-06-21 13:06 ` Dan Carpenter
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