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Further fbcon sanity checking

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This moves the

    if (num_registered_fb == FB_MAX)
            return -ENXIO;

check _AFTER_ the call to do_remove_conflicting_framebuffers() as this
would (now in a safe way) allow a native driver to replace the
conflicting one even if all slots in registered_fb[] are taken.

This also prevents unregistering a framebuffer that is no longer
registered (vga16f will unregister at module unload time even if the
frame buffer had been unregistered earlier due to being found
conflicting).

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bruno Prémont 2011-05-14 12:24:15 +02:00 committed by Linus Torvalds
parent 712f3147ae
commit c590cece75
1 changed files with 4 additions and 4 deletions
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8
drivers/video/fbmem.c
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@ -1573,15 +1573,15 @@ static int do_register_framebuffer(struct fb_info *fb_info)
struct fb_event event;
struct fb_videomode mode;
if (num_registered_fb == FB_MAX)
return -ENXIO;
if (fb_check_foreignness(fb_info))
return -ENOSYS;
do_remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
fb_is_primary_device(fb_info));
if (num_registered_fb == FB_MAX)
return -ENXIO;
num_registered_fb++;
for (i = 0 ; i < FB_MAX; i++)
if (!registered_fb[i])
@ -1639,7 +1639,7 @@ static int do_unregister_framebuffer(struct fb_info *fb_info)
int i, ret = 0;
i = fb_info->node;
if (!registered_fb[i])
if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
return -EINVAL;
if (!lock_fb_info(fb_info))