[PATCH AUTOSEL 4.19 71/87] misc: vmw_vmci: fix kernel info-leak by initializing dbells in vmci_ctx_get_chkpt_doorbells()

[Sasha Levin]

From: Anant Thazhemadam <anant.thazhemadam@xxxxxxxxx>

[ Upstream commit 31dcb6c30a26d32650ce134820f27de3c675a45a ]

A kernel-infoleak was reported by syzbot, which was caused because
dbells was left uninitialized.
Using kzalloc() instead of kmalloc() fixes this issue.

Reported-by: syzbot+a79e17c39564bedf0930@xxxxxxxxxxxxxxxxxxxxxxxxx
Tested-by: syzbot+a79e17c39564bedf0930@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Anant Thazhemadam <anant.thazhemadam@xxxxxxxxx>
Link: https://lore.kernel.org/r/20201122224534.333471-1-anant.thazhemadam@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/misc/vmw_vmci/vmci_context.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/vmw_vmci/vmci_context.c b/drivers/misc/vmw_vmci/vmci_context.c
index bc089e634a751..26e20b091160a 100644
--- a/drivers/misc/vmw_vmci/vmci_context.c
+++ b/drivers/misc/vmw_vmci/vmci_context.c
@@ -751,7 +751,7 @@ static int vmci_ctx_get_chkpt_doorbells(struct vmci_ctx *context,
 			return VMCI_ERROR_MORE_DATA;
 		}
 
-		dbells = kmalloc(data_size, GFP_ATOMIC);
+		dbells = kzalloc(data_size, GFP_ATOMIC);
 		if (!dbells)
 			return VMCI_ERROR_NO_MEM;
 
-- 
2.27.0