summaryrefslogtreecommitdiffstats
path: root/drivers/tty
diff options
context:
space:
mode:
authorNicolas Pitre <nico@fluxnic.net>2020-05-02 11:01:07 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-05-04 11:49:59 +0200
commit57d38f26d81e4275748b69372f31df545dcd9b71 (patch)
treeb807b3654d8da30cf43cc7f3843870b8d90ec63b /drivers/tty
parent092a9f59bc05904d4555fa012db12e768734ba1a (diff)
downloadlinux-57d38f26d81e4275748b69372f31df545dcd9b71.tar.bz2
vt: fix unicode console freeing with a common interface
By directly using kfree() in different places we risk missing one if it is switched to using vfree(), especially if the corresponding vmalloc() is hidden away within a common abstraction. Oh wait, that's exactly what happened here. So let's fix this by creating a common abstraction for the free case as well. Signed-off-by: Nicolas Pitre <nico@fluxnic.net> Reported-by: syzbot+0bfda3ade1ee9288a1be@syzkaller.appspotmail.com Fixes: 9a98e7a80f95 ("vt: don't use kmalloc() for the unicode screen buffer") Cc: <stable@vger.kernel.org> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Link: https://lore.kernel.org/r/nycvar.YSQ.7.76.2005021043110.2671@knanqh.ubzr Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/vt/vt.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index e5ffed795e4c..48a8199f7845 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -365,9 +365,14 @@ static struct uni_screen *vc_uniscr_alloc(unsigned int cols, unsigned int rows)
return uniscr;
}
+static void vc_uniscr_free(struct uni_screen *uniscr)
+{
+ vfree(uniscr);
+}
+
static void vc_uniscr_set(struct vc_data *vc, struct uni_screen *new_uniscr)
{
- vfree(vc->vc_uni_screen);
+ vc_uniscr_free(vc->vc_uni_screen);
vc->vc_uni_screen = new_uniscr;
}
@@ -1230,7 +1235,7 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
err = resize_screen(vc, new_cols, new_rows, user);
if (err) {
kfree(newscreen);
- kfree(new_uniscr);
+ vc_uniscr_free(new_uniscr);
return err;
}