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[PULL,2/2] hw/xen/xen_pt: fix uninitialized variable

Message ID 20230306140044.44076-3-anthony.perard@citrix.com (mailing list archive)
State New, archived
Headers show
Series [PULL,1/2] xen/pt: reserve PCI slot 2 for Intel igd-passthru | expand

Commit Message

Anthony PERARD March 6, 2023, 2 p.m. UTC 
From: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>

xen_pt_config_reg_init() reads only that many bytes as the size of the
register that is being initialized. It uses
xen_host_pci_get_{byte,word,long} and casts its last argument to
expected pointer type. This means for smaller registers higher bits of
'val' are not initialized. Then, the function fails if any of those
higher bits are set.

Fix this by initializing 'val' with zero.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Message-Id: <20230127050815.4155276-1-marmarek@invisiblethingslab.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
---
 hw/xen/xen_pt_config_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/hw/xen/xen_pt_config_init.c b/hw/xen/xen_pt_config_init.c
index cde898b744..8b9b554352 100644
--- a/hw/xen/xen_pt_config_init.c
+++ b/hw/xen/xen_pt_config_init.c
@@ -1924,7 +1924,7 @@  static void xen_pt_config_reg_init(XenPCIPassthroughState *s,
     if (reg->init) {
         uint32_t host_mask, size_mask;
         unsigned int offset;
-        uint32_t val;
+        uint32_t val = 0;
 
         /* initialize emulate register */
         rc = reg->init(s, reg_entry->reg,