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Re: [Qemu-devel] [PATCH] Fix crash with illegal "-net nic, model=xxx" op


From: Jason Wang
Subject: Re: [Qemu-devel] [PATCH] Fix crash with illegal "-net nic, model=xxx" option
Date: Mon, 13 Apr 2015 11:01:31 +0800



On Thu, Apr 9, 2015 at 9:32 PM, Thomas Huth <address@hidden> wrote:
Current QEMU crashes when specifying an illegal model with the
"-net nic,model=xxx" option, e.g.:

 $ qemu-system-x86_64 -net nic,model=n/a
 qemu-system-x86_64: Unsupported NIC model: n/a

 Program received signal SIGSEGV, Segmentation fault.

The gdb backtrace looks like this:

0x0000555555965fe0 in error_get_pretty (err=0x0) at util/error.c:152
152         return err->msg;
(gdb) bt
0 0x0000555555965fe0 in error_get_pretty (err=0x0) at util/error.c:152 1 0x0000555555965ffd in error_report_err (err=0x0) at util/error.c:157 2 0x0000555555809c90 in pci_nic_init_nofail (nd=0x555555e49860 <nd_table>, rootbus=0x5555564409b0, default_model=0x55555598c37b "e1000", default_devaddr=0x0) at hw/pci/pci.c:1663 3 0x0000555555691e42 in pc_nic_init (isa_bus=0x555556f71900, pci_bus=0x5555564409b0)
    at hw/i386/pc.c:1506
4 0x000055555569396b in pc_init1 (machine=0x5555562abbf0, pci_enabled=1, kvmclock_enabled=1)
    at hw/i386/pc_piix.c:248
5 0x0000555555693d27 in pc_init_pci (machine=0x5555562abbf0) at hw/i386/pc_piix.c:310 6 0x000055555572ddf5 in main (argc=3, argv=0x7fffffffe018, envp=0x7fffffffe038) at vl.c:4226

The problem is that pci_nic_init_nofail() does not check whether the err parameter from pci_nic_init has been set up and thus passes a NULL pointer
to error_report_err(). Fix it by correctly checking the err parameter.

Signed-off-by: Thomas Huth <address@hidden>
---
 hw/pci/pci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 6941a82..b3d5100 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1660,7 +1660,9 @@ PCIDevice *pci_nic_init_nofail(NICInfo *nd, PCIBus *rootbus, res = pci_nic_init(nd, rootbus, default_model, default_devaddr, &err);
     if (!res) {
-        error_report_err(err);
+        if (err) {
+            error_report_err(err);
+        }
         exit(1);
     }
     return res;
--
1.8.3.1

Reviewed-by: Jason Wang <address@hidden>




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