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    Subject[PATCH 5.15 863/913] proc: bootconfig: Add null pointer check
    Date
    From: Lv Ruyi <lv.ruyi@zte.com.cn>

    commit bed5b60bf67ccd8957b8c0558fead30c4a3f5d3f upstream.

    kzalloc is a memory allocation function which can return NULL when some
    internal memory errors happen. It is safer to add null pointer check.

    Link: https://lkml.kernel.org/r/20220329104004.2376879-1-lv.ruyi@zte.com.cn

    Cc: stable@vger.kernel.org
    Fixes: c1a3c36017d4 ("proc: bootconfig: Add /proc/bootconfig to show boot config list")
    Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
    Reported-by: Zeal Robot <zealci@zte.com.cn>
    Signed-off-by: Lv Ruyi <lv.ruyi@zte.com.cn>
    Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    fs/proc/bootconfig.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/fs/proc/bootconfig.c
    +++ b/fs/proc/bootconfig.c
    @@ -32,6 +32,8 @@ static int __init copy_xbc_key_value_lis
    int ret = 0;

    key = kzalloc(XBC_KEYLEN_MAX, GFP_KERNEL);
    + if (!key)
    + return -ENOMEM;

    xbc_for_each_key_value(leaf, val) {
    ret = xbc_node_compose_key(leaf, key, XBC_KEYLEN_MAX);

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