diff mbox series

[PULL,3/8] Avoid unaligned fetch in ladr_match()

Message ID 20240312113642.36862-4-jasowang@redhat.com
State New
Headers show
Series [PULL,1/8] igb: fix link state on resume | expand

Commit Message

Jason Wang March 12, 2024, 11:36 a.m. UTC 
From: Nick Briggs <nicholas.h.briggs@gmail.com>

There is no guarantee that the PCNetState is allocated such that
csr[8] is allocated on an 8-byte boundary.  Since not all hosts are
capable of unaligned fetches the 16-bit elements need to be fetched
individually to avoid a potential fault.  Closes issue #2143

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2143
Signed-off-by: Nick Briggs <nicholas.h.briggs@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/pcnet.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/hw/net/pcnet.c b/hw/net/pcnet.c
index 494eab8479..ad675ab29d 100644
--- a/hw/net/pcnet.c
+++ b/hw/net/pcnet.c
@@ -632,7 +632,7 @@  static inline int ladr_match(PCNetState *s, const uint8_t *buf, int size)
 {
     struct qemu_ether_header *hdr = (void *)buf;
     if ((*(hdr->ether_dhost)&0x01) &&
-        ((uint64_t *)&s->csr[8])[0] != 0LL) {
+        (s->csr[8] | s->csr[9] | s->csr[10] | s->csr[11]) != 0) {
         uint8_t ladr[8] = {
             s->csr[8] & 0xff, s->csr[8] >> 8,
             s->csr[9] & 0xff, s->csr[9] >> 8,