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From: Dan Carpenter <dan.carpenter@oracle.com>
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Date: 2016-09-15 13:44:56
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Subject: [patch v2] arcmsr: buffer overflow in arcmsr_iop_message_xfer()
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We need to put an upper bound on "user_len" so the memcpy() doesn't
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overflow.
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Reported-by: Marco Grassi <marco.gra@gmail.com>
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Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
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Reviewed-by: Tomas Henzl <thenzl@redhat.com>
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diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
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index 7640498..110eca9 100644
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--- a/drivers/scsi/arcmsr/arcmsr_hba.c
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+++ b/drivers/scsi/arcmsr/arcmsr_hba.c
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@@ -2388,7 +2388,8 @@ static int arcmsr_iop_message_xfer(struct AdapterControlBlock *acb,
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}
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case ARCMSR_MESSAGE_WRITE_WQBUFFER: {
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unsigned char *ver_addr;
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- int32_t user_len, cnt2end;
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+ uint32_t user_len;
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+ int32_t cnt2end;
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uint8_t *pQbuffer, *ptmpuserbuffer;
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ver_addr = kmalloc(ARCMSR_API_DATA_BUFLEN, GFP_ATOMIC);
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if (!ver_addr) {
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@@ -2397,6 +2398,11 @@ static int arcmsr_iop_message_xfer(struct AdapterControlBlock *acb,
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}
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ptmpuserbuffer = ver_addr;
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user_len = pcmdmessagefld->cmdmessage.Length;
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+ if (user_len > ARCMSR_API_DATA_BUFLEN) {
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+ retvalue = ARCMSR_MESSAGE_FAIL;
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+ kfree(ver_addr);
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+ goto message_out;
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+ }
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memcpy(ptmpuserbuffer,
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pcmdmessagefld->messagedatabuffer, user_len);
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spin_lock_irqsave(&acb->wqbuffer_lock, flags);
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--
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