[PATCHv2 libpciaccess] Ignore 32-bit domains

[Keith Busch]

A pci "domain" need not be limited to the 16-bits. The Linux kernel
currently supports 32-bit domains which cause startx to segfault. Updating
libpciaccess to support 32-bit domains breaks the library's ABI, and
domains requiring 32-bits are not necessary for startx anyway, so this
patch ignores them.

Reported-by: Pawel Baldysiak <pawel.baldysiak at intel.com>
Signed-off-by: Keith Busch <keith.busch at intel.com>
---
v1 -> v2:
  Rather than support 32-bit domains, this patch ignores them.

 src/linux_sysfs.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/linux_sysfs.c b/src/linux_sysfs.c
index 6367b11..f09a832 100644
--- a/src/linux_sysfs.c
+++ b/src/linux_sysfs.c
@@ -119,18 +119,28 @@ pci_system_linux_sysfs_create( void )
 
 
 /**
- * Filter out the names "." and ".." from the scanned sysfs entries.
+ * Filter out the names "." and ".." from the scanned sysfs entries, and
+ * domains requiring 32-bits.
  *
  * \param d  Directory entry being processed by \c scandir.
  *
  * \return
- * Zero if the entry name matches either "." or "..", non-zero otherwise.
+ * Zero if the entry name matches either "." or "..", or the domain requires
+ * 32 bits, non-zero otherwise.
  *
  * \sa scandir, populate_entries
  */
 static int
 scan_sys_pci_filter( const struct dirent * d )
 {
+    if (d->d_name[0] != '.') {
+        unsigned dom = 0;
+
+        sscanf(d->d_name, "%x:", &dom);
+        if (dom > USHRT_MAX)
+            return 0;
+    }
+
     return !((strcmp( d->d_name, "." ) == 0)
 	     || (strcmp( d->d_name, ".." ) == 0));
 }
-- 
2.7.2