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    Subject[PATCH 5.4 20/68] erofs: fix up erofs_lookup tracepoint
    Date
    From: Gao Xiang <hsiangkao@linux.alibaba.com>

    commit 93368aab0efc87288cac65e99c9ed2e0ffc9e7d0 upstream.

    Fix up a misuse that the filename pointer isn't always valid in
    the ring buffer, and we should copy the content instead.

    Link: https://lore.kernel.org/r/20210921143531.81356-1-hsiangkao@linux.alibaba.com
    Fixes: 13f06f48f7bf ("staging: erofs: support tracepoint")
    Cc: stable@vger.kernel.org # 4.19+
    Reviewed-by: Chao Yu <chao@kernel.org>
    Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    include/trace/events/erofs.h | 6 +++---
    1 file changed, 3 insertions(+), 3 deletions(-)

    --- a/include/trace/events/erofs.h
    +++ b/include/trace/events/erofs.h
    @@ -35,20 +35,20 @@ TRACE_EVENT(erofs_lookup,
    TP_STRUCT__entry(
    __field(dev_t, dev )
    __field(erofs_nid_t, nid )
    - __field(const char *, name )
    + __string(name, dentry->d_name.name )
    __field(unsigned int, flags )
    ),

    TP_fast_assign(
    __entry->dev = dir->i_sb->s_dev;
    __entry->nid = EROFS_I(dir)->nid;
    - __entry->name = dentry->d_name.name;
    + __assign_str(name, dentry->d_name.name);
    __entry->flags = flags;
    ),

    TP_printk("dev = (%d,%d), pnid = %llu, name:%s, flags:%x",
    show_dev_nid(__entry),
    - __entry->name,
    + __get_str(name),
    __entry->flags)
    );


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