ocfs2: strict bound check before memcmp in ocfs2_xattr_find_entry()
xattr in ocfs2 maybe 'non-indexed', which saved with additional space requested. It's better to check if the memory is out of bound before memcmp, although this possibility mainly comes from crafted poisonous images. Link: https://lkml.kernel.org/r/20240520024024.1976129-2-joseph.qi@linux.alibaba.com Signed-off-by: Ferry Meng <mengferry@linux.alibaba.com> Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com> Reported-by: lei lu <llfamsec@gmail.com> Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com> Cc: Changwei Ge <gechangwei@live.cn> Cc: Gang He <ghe@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Jun Piao <piaojun@huawei.com> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Mark Fasheh <mark@fasheh.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -1068,7 +1068,7 @@ static int ocfs2_xattr_find_entry(struct inode *inode, int name_index,
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{
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{
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struct ocfs2_xattr_entry *entry;
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struct ocfs2_xattr_entry *entry;
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size_t name_len;
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size_t name_len;
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int i, cmp = 1;
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int i, name_offset, cmp = 1;
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if (name == NULL)
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if (name == NULL)
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return -EINVAL;
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return -EINVAL;
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@ -1083,10 +1083,15 @@ static int ocfs2_xattr_find_entry(struct inode *inode, int name_index,
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cmp = name_index - ocfs2_xattr_get_type(entry);
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cmp = name_index - ocfs2_xattr_get_type(entry);
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if (!cmp)
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if (!cmp)
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cmp = name_len - entry->xe_name_len;
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cmp = name_len - entry->xe_name_len;
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if (!cmp)
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if (!cmp) {
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cmp = memcmp(name, (xs->base +
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name_offset = le16_to_cpu(entry->xe_name_offset);
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le16_to_cpu(entry->xe_name_offset)),
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if ((xs->base + name_offset + name_len) > xs->end) {
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name_len);
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ocfs2_error(inode->i_sb,
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"corrupted xattr entries");
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return -EFSCORRUPTED;
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}
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cmp = memcmp(name, (xs->base + name_offset), name_len);
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}
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if (cmp == 0)
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if (cmp == 0)
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break;
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break;
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entry += 1;
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entry += 1;
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