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tty/vt: don't set font mappings on vc not supporting this

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We can call this function for a dummy console that doesn't support
setting the font mapping, which will result in a null ptr BUG. So check
for this case and return error for consoles w/o font mapping support.

Reference: https://bugzilla.kernel.org/show_bug.cgi?id=59321
Signed-off-by: Imre Deak <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Imre Deak 2014-10-02 16:34:31 +03:00 • committed by Greg Kroah-Hartman
commit 9e326f7871
1 changed files with 7 additions and 0 deletions
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7
drivers/tty/vt/consolemap.c
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@ -539,6 +539,12 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
/* Save original vc_unipagdir_loc in case we allocate a new one */
p = *vc->vc_uni_pagedir_loc;
if (!p) {
err = -EINVAL;
goto out_unlock;
}
if (p->refcount > 1) {
int j, k;
@ -623,6 +629,7 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
set_inverse_transl(vc, p, i); /* Update inverse translations */
set_inverse_trans_unicode(vc, p);
out_unlock:
console_unlock();
return err;
}