From 03f2515ae0c503406f1a99a2178405049c6555db Mon Sep 17 00:00:00 2001 From: Darren Kenny Date: Fri, 27 Nov 2020 15:10:26 +0000 Subject: [PATCH] net/net: Fix possible dereference to of a NULL pointer It is always possible that grub_zalloc() could fail, so we should check for a NULL return. Otherwise we run the risk of dereferencing a NULL pointer. Fixes: CID 296221 Signed-off-by: Darren Kenny Reviewed-by: Daniel Kiper Signed-off-by: Stefan Sørensen --- grub-core/net/net.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/grub-core/net/net.c b/grub-core/net/net.c index 38f19df..7c2cdf2 100644 --- a/grub-core/net/net.c +++ b/grub-core/net/net.c @@ -86,8 +86,13 @@ grub_net_link_layer_add_address (struct grub_net_card *card, /* Add sender to cache table. */ if (card->link_layer_table == NULL) - card->link_layer_table = grub_zalloc (LINK_LAYER_CACHE_SIZE - * sizeof (card->link_layer_table[0])); + { + card->link_layer_table = grub_zalloc (LINK_LAYER_CACHE_SIZE + * sizeof (card->link_layer_table[0])); + if (card->link_layer_table == NULL) + return; + } + entry = &(card->link_layer_table[card->new_ll_entry]); entry->avail = 1; grub_memcpy (&entry->ll_address, ll, sizeof (entry->ll_address)); -- 2.14.2