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Drivers: hv: vmbus: Use struct_size() helper in kmalloc()

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Make use of the struct_size() helper instead of an open-coded version,
in order to avoid any potential type mistakes or integer overflows that,
in the worst scenario, could lead to heap overflows.

Also, address the following sparse warnings:
drivers/hv/vmbus_drv.c:1132:31: warning: using sizeof on a flexible structure

Link: https://github.com/KSPP/linux/issues/174
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20220125180131.GA67746@embeddedor
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2022-01-25 12:01:31 -06:00 committed by Wei Liu
parent 26291c54e1
commit a70d298c44
1 changed files with 1 additions and 1 deletions
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2
drivers/hv/vmbus_drv.c
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@ -1129,7 +1129,7 @@ void vmbus_on_msg_dpc(unsigned long data)
}
if (entry->handler_type == VMHT_BLOCKING) {
ctx = kmalloc(sizeof(*ctx) + payload_size, GFP_ATOMIC);
ctx = kmalloc(struct_size(ctx, msg.payload, payload_size), GFP_ATOMIC);
if (ctx == NULL)
return;