X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=block%2Fbsg.c;h=a57046de2f07f00eae78aaabe9b5e43c1ecc178f;hb=cb38b45346f17f4b0a105b9315b030a2e24fb7e6;hp=8a05a404ae708503589bdf33643948c37d243e62;hpb=8421c60446290c0fef1858a806261871a40ebf76;p=linux.git

diff --git a/block/bsg.c b/block/bsg.c
index 8a05a404ae70..a57046de2f07 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -655,6 +655,9 @@ bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 
 	dprintk("%s: write %Zd bytes\n", bd->name, count);
 
+	if (unlikely(segment_eq(get_fs(), KERNEL_DS)))
+		return -EINVAL;
+
 	bsg_set_block(bd, file);
 
 	bytes_written = 0;