From: Johannes Berg Date: Thu, 16 Sep 2010 22:38:25 +0000 (+0200) Subject: wext: fix potential private ioctl memory content leak X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=df6d02300f7c2fbd0fbe626d819c8e5237d72c62;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git wext: fix potential private ioctl memory content leak When a driver doesn't fill the entire buffer, old heap contents may remain, and if it also doesn't update the length properly, this old heap content will be copied back to userspace. It is very unlikely that this happens in any of the drivers using private ioctls since it would show up as junk being reported by iwpriv, but it seems better to be safe here, so use kzalloc. Reported-by: Jeff Mahoney Cc: stable@kernel.org Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- diff --git a/net/wireless/wext-priv.c b/net/wireless/wext-priv.c index 3feb28e41c53..674d426a9d24 100644 --- a/net/wireless/wext-priv.c +++ b/net/wireless/wext-priv.c @@ -152,7 +152,7 @@ static int ioctl_private_iw_point(struct iw_point *iwp, unsigned int cmd, } else if (!iwp->pointer) return -EFAULT; - extra = kmalloc(extra_size, GFP_KERNEL); + extra = kzalloc(extra_size, GFP_KERNEL); if (!extra) return -ENOMEM;