From 35ad61921f495ee14915d185de79478c1737b4da Mon Sep 17 00:00:00 2001 From: Niklas Cassel Date: Thu, 14 Dec 2017 14:01:46 +0100 Subject: [PATCH] PCI: endpoint: Fix find_first_zero_bit() usage find_first_zero_bit()'s parameter 'size' is defined in bits, not in bytes. Calling find_first_zero_bit() with the wrong size unit will lead to insidious bugs. Fix this by calling find_first_zero_bit() with size BITS_PER_LONG, rather than sizeof() and add missing find_first_zero_bit() return handling. Fixes: d74679911610 ("PCI: endpoint: Introduce configfs entry for configuring EP functions") Signed-off-by: Niklas Cassel Signed-off-by: Lorenzo Pieralisi Acked-by: Kishon Vijay Abraham I --- drivers/pci/endpoint/pci-ep-cfs.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c index e8f65eb51c1a..c9a2fb9dd49d 100644 --- a/drivers/pci/endpoint/pci-ep-cfs.c +++ b/drivers/pci/endpoint/pci-ep-cfs.c @@ -103,7 +103,10 @@ static int pci_epc_epf_link(struct config_item *epc_item, struct pci_epf *epf = epf_group->epf; func_no = find_first_zero_bit(&epc_group->function_num_map, - sizeof(epc_group->function_num_map)); + BITS_PER_LONG); + if (func_no >= BITS_PER_LONG) + return -EINVAL; + set_bit(func_no, &epc_group->function_num_map); epf->func_no = func_no;