[xen stable-4.19] xen/pci: prevent infinite loop for faulty SR-IOV cards

[patchbot@xxxxxxx]

commit 54d8d847f49f0426a700baa0e05e8a2dc8214fbd
Author:     Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
AuthorDate: Mon Nov 10 16:04:03 2025 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Nov 10 16:04:03 2025 +0100

    xen/pci: prevent infinite loop for faulty SR-IOV cards
    
    If a SR-IOV card presents an I/O space inside a BAR the
    code will continue to loop on the same card.
    This is due to the missing increment of the cycle variable.
    
    Fixes: a1a6d59862f4 ("pci: split code to size BARs from pci_add_device")
    Signed-off-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: f7091c0e1fd43877621d4eb2c1c4106797b3c551
    master date: 2025-10-27 15:52:20 +0100
---
 xen/drivers/passthrough/pci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c
index 4d06e5d3f9..80e06c0a78 100644
--- a/xen/drivers/passthrough/pci.c
+++ b/xen/drivers/passthrough/pci.c
@@ -766,6 +766,7 @@ int pci_add_device(u16 seg, u8 bus, u8 devfn,
                     printk(XENLOG_WARNING
                            "SR-IOV device %pp with vf BAR%u in IO space\n",
                            &pdev->sbdf, i);
+                    ++i;
                     continue;
                 }
                 ret = pci_size_mem_bar(pdev->sbdf, idx, NULL,
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.19