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| author | James Sewart <jamessewart@arista.com> | 2019-12-11 00:51:33 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2019-12-18 21:21:16 +0300 |
| commit | f8bf2aeb651b3460a4b36fd7ba1ba1d31777d35c (patch) | |
| tree | 202de2282e09e50ca722a0e65f336fee7c36a901 /drivers/pci/search.c | |
| parent | 8c386cc817878588195dde38e919aa6ba9409d58 (diff) | |
| download | linux-f8bf2aeb651b3460a4b36fd7ba1ba1d31777d35c.tar.xz | |
PCI: Fix pci_add_dma_alias() bitmask size
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 338c3149a221 ("PCI: Add support for multiple DMA
aliases") and c6635792737b ("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>
Diffstat (limited to 'drivers/pci/search.c')
| -rw-r--r-- | drivers/pci/search.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/pci/search.c b/drivers/pci/search.c index bade14002fd8..e4dbdef5aef0 100644 --- a/drivers/pci/search.c +++ b/drivers/pci/search.c @@ -41,9 +41,9 @@ int pci_for_each_dma_alias(struct pci_dev *pdev, * DMA, iterate over that too. */ if (unlikely(pdev->dma_alias_mask)) { - u8 devfn; + unsigned int devfn; - for_each_set_bit(devfn, pdev->dma_alias_mask, U8_MAX) { + for_each_set_bit(devfn, pdev->dma_alias_mask, MAX_NR_DEVFNS) { ret = fn(pdev, PCI_DEVID(pdev->bus->number, devfn), data); if (ret) |