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PCI: Fix pci_add_dma_alias() bitmask size

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The number of possible devfns is 256, but pci_add_dma_alias() allocated a
bitmap of size 255.  Fix this off-by-one error.

This fixes commits 338c3149a2 ("PCI: Add support for multiple DMA
aliases") and c663579273 ("PCI: Allocate dma_alias_mask with
bitmap_zalloc()"), but I doubt it was possible to see a problem because
it takes 4 64-bit longs (or 8 32-bit longs) to hold 255 bits, and
bitmap_zalloc() doesn't save the 255-bit size anywhere.

[bhelgaas: commit log, move #define to drivers/pci/pci.h, include loop
limit fix from Qian Cai:
https://lore.kernel.org/r/20191218170004.5297-1-cai@lca.pw]
Signed-off-by: James Sewart <jamessewart@arista.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
This commit is contained in:
James Sewart
2019-12-10 15:51:33 -06:00
committed by Bjorn Helgaas
parent 8c386cc817
commit f8bf2aeb65
3 changed files with 6 additions and 3 deletions
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2
drivers/pci/pci.c
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@@ -6017,7 +6017,7 @@ EXPORT_SYMBOL_GPL(pci_pr3_present);
void pci_add_dma_alias(struct pci_dev *dev, u8 devfn)
{
if (!dev->dma_alias_mask)
dev->dma_alias_mask = bitmap_zalloc(U8_MAX, GFP_KERNEL);
dev->dma_alias_mask = bitmap_zalloc(MAX_NR_DEVFNS, GFP_KERNEL);
if (!dev->dma_alias_mask) {
pci_warn(dev, "Unable to allocate DMA alias mask\n");
return;