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Date: Sat, 13 Aug 2016 18:42:58 +0100 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, "Jan Beulich" <JBeulich@...e.com>, "Boris Ostrovsky" <boris.ostrovsky@...cle.com>, "Andrey Grodzovsky" <andrey2805@...il.com>, "David Vrabel" <david.vrabel@...rix.com> Subject: [PATCH 3.2 64/94] xen/pciback: Fix conf_space read/write overlap check. 3.2.82-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Andrey Grodzovsky <andrey2805@...il.com> commit 02ef871ecac290919ea0c783d05da7eedeffc10e upstream. Current overlap check is evaluating to false a case where a filter field is fully contained (proper subset) of a r/w request. This change applies classical overlap check instead to include all the scenarios. More specifically, for (Hilscher GmbH CIFX 50E-DP(M/S)) device driver the logic is such that the entire confspace is read and written in 4 byte chunks. In this case as an example, CACHE_LINE_SIZE, LATENCY_TIMER and PCI_BIST are arriving together in one call to xen_pcibk_config_write() with offset == 0xc and size == 4. With the exsisting overlap check the LATENCY_TIMER field (offset == 0xd, length == 1) is fully contained in the write request and hence is excluded from write, which is incorrect. Signed-off-by: Andrey Grodzovsky <andrey2805@...il.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com> Reviewed-by: Jan Beulich <JBeulich@...e.com> Signed-off-by: David Vrabel <david.vrabel@...rix.com> Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- drivers/xen/xen-pciback/conf_space.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) --- a/drivers/xen/xen-pciback/conf_space.c +++ b/drivers/xen/xen-pciback/conf_space.c @@ -183,8 +183,7 @@ int xen_pcibk_config_read(struct pci_dev field_start = OFFSET(cfg_entry); field_end = OFFSET(cfg_entry) + field->size; - if ((req_start >= field_start && req_start < field_end) - || (req_end > field_start && req_end <= field_end)) { + if (req_end > field_start && field_end > req_start) { err = conf_space_read(dev, cfg_entry, field_start, &tmp_val); if (err) @@ -230,8 +229,7 @@ int xen_pcibk_config_write(struct pci_de field_start = OFFSET(cfg_entry); field_end = OFFSET(cfg_entry) + field->size; - if ((req_start >= field_start && req_start < field_end) - || (req_end > field_start && req_end <= field_end)) { + if (req_end > field_start && field_end > req_start) { tmp_val = 0; err = xen_pcibk_config_read(dev, field_start,
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