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vt: move vc_saved_screen to within tty allocated judgment 

Everything starts with the assumption that a tty has been allocated.
Therefore, Move it to within the tty allocation check.

Fixes: 23743ba647 ("vt: add support for smput/rmput escape codes")
Reported-by: syzbot+f6cb41c144427dc0796a@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=f6cb41c144427dc0796a
Tested-by: syzbot+f6cb41c144427dc0796a@syzkaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/tencent_CAD45DB31906CF890DBB25AB0DED12205D07@qq.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Edward Adam Davis 2025-09-09 08:51:22 +08:00 committed by Greg Kroah-Hartman
parent e81783899d
commit fc702e7df4
1 changed files with 4 additions and 4 deletions
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2
drivers/tty/vt/vt.c
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@ -1341,11 +1341,11 @@ struct vc_data *vc_deallocate(unsigned int currcons)
vc_uniscr_set(vc, NULL); vc_uniscr_set(vc, NULL);
kfree(vc->vc_screenbuf); kfree(vc->vc_screenbuf);
vc_cons[currcons].d = NULL; vc_cons[currcons].d = NULL;
}
if (vc->vc_saved_screen != NULL) { if (vc->vc_saved_screen != NULL) {
kfree(vc->vc_saved_screen); kfree(vc->vc_saved_screen);
vc->vc_saved_screen = NULL; vc->vc_saved_screen = NULL;
} }
}
return vc; return vc;
} }