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tracing/uprobes: Fix to return -EFAULT if copy_from_user failed
Fix probe_mem_read() to return -EFAULT if copy_from_user() failed. The copy_from_user() returns remaining bytes when it failed, but probe_mem_read() caller expects it returns error code like as probe_kernel_read(). Link: http://lkml.kernel.org/r/153547306719.26502.8353484532699160223.stgit@devbox Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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@ -105,7 +105,7 @@ probe_mem_read(void *dest, void *src, size_t size)
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{
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void __user *vaddr = (void __force __user *)src;
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return copy_from_user(dest, vaddr, size);
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return copy_from_user(dest, vaddr, size) ? -EFAULT : 0;
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}
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/*
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* Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max
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