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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Darren Kenny <darren.kenny@oracle.com>
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Date: Fri, 27 Nov 2020 15:10:26 +0000
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Subject: [PATCH] net/net: Fix possible dereference to of a NULL pointer
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It is always possible that grub_zalloc() could fail, so we should check for
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a NULL return. Otherwise we run the risk of dereferencing a NULL pointer.
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Fixes: CID 296221
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Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/net/net.c | 9 +++++++--
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1 file changed, 7 insertions(+), 2 deletions(-)
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diff --git a/grub-core/net/net.c b/grub-core/net/net.c
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index 1fd104aeaf2..a27c53eee1c 100644
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--- a/grub-core/net/net.c
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+++ b/grub-core/net/net.c
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@@ -89,8 +89,13 @@ grub_net_link_layer_add_address (struct grub_net_card *card,
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/* Add sender to cache table. */
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if (card->link_layer_table == NULL)
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- card->link_layer_table = grub_zalloc (LINK_LAYER_CACHE_SIZE
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- * sizeof (card->link_layer_table[0]));
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+ {
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+ card->link_layer_table = grub_zalloc (LINK_LAYER_CACHE_SIZE
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+ * sizeof (card->link_layer_table[0]));
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+ if (card->link_layer_table == NULL)
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+ return;
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+ }
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+
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entry = &(card->link_layer_table[card->new_ll_entry]);
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entry->avail = 1;
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grub_memcpy (&entry->ll_address, ll, sizeof (entry->ll_address));
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