[PATCH 3.4 1/9] SCSI: megaraid: missing bounds check in mimd_to_kioc()

From: Greg Kroah-Hartman
Date: Fri May 16 2014 - 18:53:17 EST


3.4-stable review patch. If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

commit 3de2260140417759c669d391613d583baf03b0cf upstream.

pthru32->dataxferlen comes from the user so we need to check that it's
not too large so we don't overflow the buffer.

Reported-by: Nico Golde <nico@xxxxxxxxx>
Reported-by: Fabian Yamaguchi <fabs@xxxxxxxxx>
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Acked-by: Sumit Saxena <sumit.saxena@xxxxxxx>
Signed-off-by: James Bottomley <JBottomley@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/scsi/megaraid/megaraid_mm.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/scsi/megaraid/megaraid_mm.c
+++ b/drivers/scsi/megaraid/megaraid_mm.c
@@ -486,6 +486,8 @@ mimd_to_kioc(mimd_t __user *umimd, mraid

pthru32->dataxferaddr = kioc->buf_paddr;
if (kioc->data_dir & UIOC_WR) {
+ if (pthru32->dataxferlen > kioc->xferlen)
+ return -EINVAL;
if (copy_from_user(kioc->buf_vaddr, kioc->user_data,
pthru32->dataxferlen)) {
return (-EFAULT);


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