[Stable-9.1.2 43/58] ppc/pnv: ADU fix possible buffer overrun with invalid size

[Michael Tokarev]

From: Nicholas Piggin <npiggin@gmail.com>

The ADU LPC transfer-size field is 7 bits, but the supported sizes for
LPC access via ADU appear to be 1, 2, 4, 8. The data buffer could
overrun if firmware set an invalid size field, so add checks to reject
them with a message.

Cc: qemu-stable@nongnu.org
Reported-by: Cédric Le Goater <clg@redhat.com>
Resolves: Coverity CID 1558830
Fixes: 24bd283bccb33 ("ppc/pnv: Implement ADU access to LPC space")
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
(cherry picked from commit ddd2a060a0da41000ddca31e329ab1d54e37fedb)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/hw/ppc/pnv_adu.c b/hw/ppc/pnv_adu.c
index 81b7d6e526..f636dedf79 100644
--- a/hw/ppc/pnv_adu.c
+++ b/hw/ppc/pnv_adu.c
@@ -116,6 +116,12 @@ static void pnv_adu_xscom_write(void *opaque, hwaddr addr, 
uint64_t val,
             uint32_t lpc_size = lpc_cmd_size(adu);
             uint64_t data = 0;
 
+            if (!is_power_of_2(lpc_size) || lpc_size > sizeof(data)) {
+                qemu_log_mask(LOG_GUEST_ERROR, "ADU: Unsupported LPC access "
+                                               "size:%" PRId32 "\n", lpc_size);
+                break;
+            }
+
             pnv_lpc_opb_read(adu->lpc, lpc_addr, (void *)&data, lpc_size);
 
             /*
@@ -135,6 +141,12 @@ static void pnv_adu_xscom_write(void *opaque, hwaddr addr, 
uint64_t val,
             uint32_t lpc_size = lpc_cmd_size(adu);
             uint64_t data;
 
+            if (!is_power_of_2(lpc_size) || lpc_size > sizeof(data)) {
+                qemu_log_mask(LOG_GUEST_ERROR, "ADU: Unsupported LPC access "
+                                               "size:%" PRId32 "\n", lpc_size);
+                break;
+            }
+
             data = cpu_to_be64(val) >> ((lpc_addr & 7) * 8); /* See above */
             pnv_lpc_opb_write(adu->lpc, lpc_addr, (void *)&data, lpc_size);
         }
-- 
2.39.5