WASHINGTON — Years before the release in December of a Senate Intelligence Committee report detailing the C.I.A.’s use of torture and deceit in its detention program, an internal review by the agency found that the C.I.A. had repeatedly overstated the value of intelligence gained during the brutal interrogations of some of its detainees.

The internal report, more than 1,000 pages in length, came to be known as the Panetta Review after Leon E. Panetta, who, as the C.I.A.’s director, ordered that it be done in 2009. At least one of its authors won an agency award for her work, according to a recent briefing that the agency’s inspector general gave to staff members of the Senate Intelligence Committee.

The contents of the Panetta Review, which remain classified, are now central to simmering battles over the Intelligence Committee’s conclusions about the efficacy of torture and the C.I.A.’s allegations that committee staffers improperly took the review from an agency facility. The C.I.A. has publicly distanced itself from the report’s findings, saying that it was an incomplete and cursory review of documents, and has blocked its release under the Freedom of Information Act.