From: Marta Rybczynska <rybczyn...@gmail.com> This fix removes a possible NULL pointer dereference in grub networking code. It is a part of a security series [1].
[1] https://lists.gnu.org/archive/html/grub-devel/2021-03/msg00007.html Signed-off-by: Marta Rybczynska <marta.rybczyn...@huawei.com> Signed-off-by: Steve Sakoman <st...@sakoman.com> --- ...ible-dereference-to-of-a-NULL-pointe.patch | 39 +++++++++++++++++++ meta/recipes-bsp/grub/grub2.inc | 1 + 2 files changed, 40 insertions(+) create mode 100644 meta/recipes-bsp/grub/files/0002-net-net-Fix-possible-dereference-to-of-a-NULL-pointe.patch diff --git a/meta/recipes-bsp/grub/files/0002-net-net-Fix-possible-dereference-to-of-a-NULL-pointe.patch b/meta/recipes-bsp/grub/files/0002-net-net-Fix-possible-dereference-to-of-a-NULL-pointe.patch new file mode 100644 index 0000000000..d00821f5c3 --- /dev/null +++ b/meta/recipes-bsp/grub/files/0002-net-net-Fix-possible-dereference-to-of-a-NULL-pointe.patch @@ -0,0 +1,39 @@ +From f216a75e884ed5e4e94bf86965000dde51148f94 Mon Sep 17 00:00:00 2001 +From: Darren Kenny <darren.ke...@oracle.com> +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 <darren.ke...@oracle.com> +Reviewed-by: Daniel Kiper <daniel.ki...@oracle.com> + +Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=03f2515ae0c503406f1a99a2178405049c6555db] +Signed-off-by: Marta Rybczynska <marta.rybczyn...@huawei.com> +--- + 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)); diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc index a06beac5ef..2c0bff8fd0 100644 --- a/meta/recipes-bsp/grub/grub2.inc +++ b/meta/recipes-bsp/grub/grub2.inc @@ -48,6 +48,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \ file://CVE-2020-25632.patch \ file://CVE-2020-25647.patch \ file://0001-mmap-Fix-memory-leak-when-iterating-over-mapped-memo.patch \ + file://0002-net-net-Fix-possible-dereference-to-of-a-NULL-pointe.patch \ " SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934" SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea" -- 2.25.1
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