Abu Dawud said: The name of 'Amr b. Muslim in the chain narrated by Malik and Muhammad b. 'Amr is disputed. Some say that it is 'Umar and the majority holds that it is 'Amr.
Abu Dawud said: He is 'Amr b. Muslim b. Ukaimah al-Laithi al-Jundu'i.
In-book : Book 16, Hadith 4
English translation : Book 15, Hadith 2785