PCI: Fix pci_add_dma_alias() bitmask size

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[ Upstream commit f8bf2aeb65 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

James Sewart 2019-12-10 15:51:33 -06:00 • committed by Greg Kroah-Hartman

parent fa0c8172a9

commit 1f4037adfa

3 changed files with 6 additions and 3 deletions

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2

drivers/pci/pci.c

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3

drivers/pci/pci.h

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4

drivers/pci/search.c

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