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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Mon, 18 Jan 2021 17:06:19 +1100
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Subject: [PATCH] fs/nilfs2: Properly bail on errors in
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grub_nilfs2_btree_node_lookup()
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We just introduced an error return in grub_nilfs2_btree_node_lookup().
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Make sure the callers catch it.
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At the same time, make sure that grub_nilfs2_btree_node_lookup() always
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inits the index pointer passed to it.
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/fs/nilfs2.c | 11 ++++++++---
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1 file changed, 8 insertions(+), 3 deletions(-)
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diff --git a/grub-core/fs/nilfs2.c b/grub-core/fs/nilfs2.c
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index 054ad3dc18a..c4c4610bec0 100644
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--- a/grub-core/fs/nilfs2.c
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+++ b/grub-core/fs/nilfs2.c
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@@ -433,7 +433,7 @@ grub_nilfs2_btree_node_lookup (struct grub_nilfs2_data *data,
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grub_uint64_t key, int *indexp)
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{
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grub_uint64_t nkey;
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- int index, low, high, s;
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+ int index = 0, low, high, s;
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low = 0;
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@@ -441,10 +441,10 @@ grub_nilfs2_btree_node_lookup (struct grub_nilfs2_data *data,
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if (high >= grub_nilfs2_btree_node_nchildren_max (data, node))
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{
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grub_error (GRUB_ERR_BAD_FS, "too many children");
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+ *indexp = index;
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return 0;
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}
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- index = 0;
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s = 0;
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while (low <= high)
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{
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@@ -526,6 +526,10 @@ grub_nilfs2_btree_lookup (struct grub_nilfs2_data *data,
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level = grub_nilfs2_btree_get_level (node);
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found = grub_nilfs2_btree_node_lookup (data, node, key, &index);
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+
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+ if (grub_errno != GRUB_ERR_NONE)
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+ goto fail;
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+
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ptr = grub_nilfs2_btree_node_get_ptr (data, node, index);
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if (need_translate)
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ptr = grub_nilfs2_dat_translate (data, ptr);
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@@ -550,7 +554,8 @@ grub_nilfs2_btree_lookup (struct grub_nilfs2_data *data,
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else
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index = 0;
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- if (index < grub_nilfs2_btree_node_nchildren_max (data, node))
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+ if (index < grub_nilfs2_btree_node_nchildren_max (data, node) &&
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+ grub_errno == GRUB_ERR_NONE)
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{
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ptr = grub_nilfs2_btree_node_get_ptr (data, node, index);
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if (need_translate)
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