fbdev: save the activate field before calling fb_check_var()

Some drivers may reset the var->activate field on fb_check_var(). This can
lead to undefined behavior. For example, doing fbset -a <option> with vga16fb
will only modify the active console instead of modifying all.

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index c4ce3e44327e..cd1407921af5 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -803,6 +803,8 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 
         if ((var->activate & FB_ACTIVATE_FORCE) ||
             memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
+                u32 activate = var->activate;
+
                 if (!info->fbops->fb_check_var) {
                         *var = info->var;
                         return 0;
@@ -831,7 +833,7 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 
                         if (!err && (flags & FBINFO_MISC_USEREVENT)) {
                                 struct fb_event event;
-                                int evnt = (var->activate & FB_ACTIVATE_ALL) ?
+                                int evnt = (activate & FB_ACTIVATE_ALL) ?
                                         FB_EVENT_MODE_CHANGE_ALL :
                                         FB_EVENT_MODE_CHANGE;