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The original implementation of memcpy_sglist() was broken because it didn't handle scatterlists that describe exactly the same memory, which is a case that many callers rely on. The current implementation is broken too because it calls the skcipher_walk functions which can fail. It ignores any errors from those functions. Fix it by replacing it with a new implementation written from scratch. It always succeeds. It's also a bit faster, since it avoids the overhead of skcipher_walk. skcipher_walk includes a lot of functionality (such as alignmask handling) that's irrelevant here. Reported-by: Colin Ian King <coking@nvidia.com> Closes: https://lore.kernel.org/r/20251114122620.111623-1-coking@nvidia.com Fixes:131bdceca1("crypto: scatterwalk - Add memcpy_sglist") Fixes:0f8d42bf12("crypto: scatterwalk - Move skcipher walk and use it for memcpy_sglist") Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>