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    Subject[PATCH] remoteproc: avoid stack overflow in debugfs file
    Date
    Recent gcc versions warn about reading from a negative offset of
    an on-stack array:

    drivers/remoteproc/remoteproc_debugfs.c: In function 'rproc_recovery_write':
    drivers/remoteproc/remoteproc_debugfs.c:167:9: warning: 'buf[4294967295u]' may be used uninitialized in this function [-Wmaybe-uninitialized]

    I don't see anything in sys_write() that prevents us from
    being called with a zero 'count' argument, so we should
    add an extra check in rproc_recovery_write() to prevent the
    access and avoid the warning.

    Signed-off-by: Arnd Bergmann <arnd@arndb.de>
    Fixes: 2e37abb89a2e ("remoteproc: create a 'recovery' debugfs entry")

    diff --git a/drivers/remoteproc/remoteproc_debugfs.c b/drivers/remoteproc/remoteproc_debugfs.c
    index 9d30809bb407..916af5096f57 100644
    --- a/drivers/remoteproc/remoteproc_debugfs.c
    +++ b/drivers/remoteproc/remoteproc_debugfs.c
    @@ -156,7 +156,7 @@ rproc_recovery_write(struct file *filp, const char __user *user_buf,
    char buf[10];
    int ret;

    - if (count > sizeof(buf))
    + if (count < 1 || count > sizeof(buf))
    return count;

    ret = copy_from_user(buf, user_buf, count);


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