From: Wenliang Fan <fanwlexca@gmail.com>
To: clm@fb.com, jbacik@fb.com
Cc: linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org,
Wenliang Fan <fanwlexca@gmail.com>
Subject: [PATCH] fs/btrfs: Integer overflow in btrfs_ioctl_resize()
Date: Fri, 20 Dec 2013 15:28:56 +0800 [thread overview]
Message-ID: <1387524536-29828-1-git-send-email-fanwlexca@gmail.com> (raw)
The local variable 'new_size' comes from userspace. If a large number
was passed, there would be an integer overflow in the following line:
new_size = old_size + new_size;
Signed-off-by: Wenliang Fan <fanwlexca@gmail.com>
---
fs/btrfs/ioctl.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 21da576..92f7707 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1466,6 +1466,10 @@ static noinline int btrfs_ioctl_resize(struct file *file,
}
new_size = old_size - new_size;
} else if (mod > 0) {
+ if (new_size > ULLONG_MAX - old_size) {
+ ret = -EINVAL;
+ goto out_free;
+ }
new_size = old_size + new_size;
}
--
1.8.5.rc1.28.g7061504
reply other threads:[~2013-12-20 7:29 UTC|newest]
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