From: Dan Carpenter <dan.carpenter@oracle.com>
To: kernel-janitors@vger.kernel.org
Subject: [patch 1/2] Staging: lustre: integer overflow in ioctl
Date: Wed, 01 Apr 2015 08:12:15 +0000 [thread overview]
Message-ID: <20150401081215.GA21130@mwanda> (raw)
hdr->ioc_len is a user controlled u32 so the addition can overflow,
especially on 32 bit systems.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/drivers/staging/lustre/lustre/libcfs/linux/linux-module.c b/drivers/staging/lustre/lustre/libcfs/linux/linux-module.c
index a5effcd..e962f89 100644
--- a/drivers/staging/lustre/lustre/libcfs/linux/linux-module.c
+++ b/drivers/staging/lustre/lustre/libcfs/linux/linux-module.c
@@ -57,7 +57,7 @@ int libcfs_ioctl_getdata(char *buf, char *end, void *arg)
return -EINVAL;
}
- if (hdr->ioc_len + buf >= end) {
+ if (hdr->ioc_len >= end - buf) {
CERROR("PORTALS: user buffer exceeds kernel buffer\n");
return -EINVAL;
}
reply other threads:[~2015-04-01 8:12 UTC|newest]
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