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| author | Colin Ian King <colin.king@canonical.com> | 2018-10-25 15:52:31 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <helgaas@kernel.org> | 2018-11-09 01:01:14 +0100 |
| commit | 53bb565fc5439f2c8c57a786feea5946804aa3e9 (patch) | |
| tree | efddacc1ac1d82add09e750b821f3649a43fb4e4 /arch/x86 | |
| parent | Linux 4.20-rc1 (diff) | |
| download | linux-53bb565fc5439f2c8c57a786feea5946804aa3e9.tar.xz linux-53bb565fc5439f2c8c57a786feea5946804aa3e9.zip | |
x86/PCI: Fix Broadcom CNB20LE unintended sign extension (redux)
In the expression "word1 << 16", word1 starts as u16, but is promoted to a
signed int, then sign-extended to resource_size_t, which is probably not
what was intended. Cast to resource_size_t to avoid the sign extension.
This fixes an identical issue as fixed by commit 0b2d70764bb3 ("x86/PCI:
Fix Broadcom CNB20LE unintended sign extension") back in 2014.
Detected by CoverityScan, CID#138749, 138750 ("Unintended sign extension")
Fixes: 3f6ea84a3035 ("PCI: read memory ranges out of Broadcom CNB20LE host bridge")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Bjorn Helgaas <helgaas@kernel.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/pci/broadcom_bus.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/pci/broadcom_bus.c b/arch/x86/pci/broadcom_bus.c index 526536c81ddc..ca1e8e6dccc8 100644 --- a/arch/x86/pci/broadcom_bus.c +++ b/arch/x86/pci/broadcom_bus.c @@ -50,8 +50,8 @@ static void __init cnb20le_res(u8 bus, u8 slot, u8 func) word1 = read_pci_config_16(bus, slot, func, 0xc0); word2 = read_pci_config_16(bus, slot, func, 0xc2); if (word1 != word2) { - res.start = (word1 << 16) | 0x0000; - res.end = (word2 << 16) | 0xffff; + res.start = ((resource_size_t) word1 << 16) | 0x0000; + res.end = ((resource_size_t) word2 << 16) | 0xffff; res.flags = IORESOURCE_MEM; update_res(info, res.start, res.end, res.flags, 0); } |