4.14-stable review patch. If anyone has any objections, please let me know.
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From: Niklas Cassel niklas.cassel@axis.com
[ Upstream commit 35ad61921f495ee14915d185de79478c1737b4da ]
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 niklas.cassel@axis.com Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Acked-by: Kishon Vijay Abraham I kishon@ti.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pci/endpoint/pci-ep-cfs.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/pci/endpoint/pci-ep-cfs.c +++ b/drivers/pci/endpoint/pci-ep-cfs.c @@ -109,7 +109,10 @@ static int pci_epc_epf_link(struct confi goto err_add_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;