On Thu, Sep 15, 2016 at 09:59:01AM -0400, Martin K. Petersen wrote:
> >>>>> "Dan" == Dan Carpenter <dan.carpenter@xxxxxxxxxx> writes:
>
> Dan> We need to put an upper bound on "user_len" so the memcpy() doesn't
> Dan> overflow.
>
> Applied to 4.9/scsi-queue.
Yap, Tomas said the kfree was missing on the error path but can we
simplify this further by doing the user_len check first so that the
kfree() is not even needed?
Patch ontop:
---
From: Borislav Petkov <bp@xxxxxxx>
Date: Fri, 23 Sep 2016 13:04:51 +0200
Subject: [PATCH] scsi: arcmsr: Simplify user_len checking
Do the user_len check first and then the ver_addr allocation so that
we can save us the kfree() on the error path when user_len is >
ARCMSR_API_DATA_BUFLEN.
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Cc: Marco Grassi <marco.gra@xxxxxxxxx>
Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Cc: Tomas Henzl <thenzl@xxxxxxxxxx>
Cc: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
---
drivers/scsi/arcmsr/arcmsr_hba.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
index 110eca9eaca0..3d53d636b17b 100644
--- a/drivers/scsi/arcmsr/arcmsr_hba.c
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c
@@ -2391,18 +2391,20 @@ static int arcmsr_iop_message_xfer(struct AdapterControlBlock *acb,
uint32_t user_len;
int32_t cnt2end;
uint8_t *pQbuffer, *ptmpuserbuffer;
- ver_addr = kmalloc(ARCMSR_API_DATA_BUFLEN, GFP_ATOMIC);
- if (!ver_addr) {
+
+ user_len = pcmdmessagefld->cmdmessage.Length;
+ if (user_len > ARCMSR_API_DATA_BUFLEN) {
retvalue = ARCMSR_MESSAGE_FAIL;
goto message_out;
}
- ptmpuserbuffer = ver_addr;
- user_len = pcmdmessagefld->cmdmessage.Length;
- if (user_len > ARCMSR_API_DATA_BUFLEN) {
+
+ ver_addr = kmalloc(ARCMSR_API_DATA_BUFLEN, GFP_ATOMIC);
+ if (!ver_addr) {
retvalue = ARCMSR_MESSAGE_FAIL;
- kfree(ver_addr);
goto message_out;
}
+ ptmpuserbuffer = ver_addr;
+
memcpy(ptmpuserbuffer,
pcmdmessagefld->messagedatabuffer, user_len);
spin_lock_irqsave(&acb->wqbuffer_lock, flags);
--
1.8.5.2
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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