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fbdevhw: Refuse to touch PCI devices on the fallback probe path

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Fixes: https://gitlab.freedesktop.org/xorg/driver/xf86-video-fbdev/issues/9
Signed-off-by: Adam Jackson <ajax@redhat.com>
(cherry picked from commit fc78bcca21)
This commit is contained in:
Adam Jackson 2018-10-10 14:09:11 -04:00
parent 4795c069a5
commit f5dc787fc9
1 changed files with 16 additions and 0 deletions
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16
hw/xfree86/fbdevhw/fbdevhw.c
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@ -329,6 +329,22 @@ fbdev_open(int scrnIndex, const char *dev, char **namep)
return -1;
}
/* only touch non-PCI devices on this path */
{
char buf[PATH_MAX];
char *sysfs_path = NULL;
char *node = strrchr(dev, '/') + 1;
if (asprintf(&sysfs_path, "/sys/class/graphics/%s", node) < 0 ||
readlink(sysfs_path, buf, sizeof(buf) < 0) ||
strstr(buf, "devices/pci")) {
free(sysfs_path);
close(fd);
return -1;
}
free(sysfs_path);
}
if (namep) {
if (-1 == ioctl(fd, FBIOGET_FSCREENINFO, (void *) (&fix))) {
*namep = NULL;