From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 667F33ED12F for ; Mon, 9 Mar 2026 20:24:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773087873; cv=none; b=rBqkbjrp3vMmldsg9kC4FeOnpkcBNlcbDrFo2otIS/dHe5f4kF3KlBpQQHCu/I8yKEVqK7PHwUPvLIJJ+slGWkAbp0XHEEDF+s8q73VSX+kC4X31Z0JuPlhtFOpmcuHIGmED2KUCyzGI6e7b3NJOf5gEbVuevd8bV1ISXwvGyuI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773087873; c=relaxed/simple; bh=RHSsmc9nYmI9FyP2Z4aoYEmwjnRG71zaeGl7rvaM7kA=; h=Date:To:From:Subject:Message-Id; b=PhShjMjJvwpSjyHOOJS/IuoIxLT6P+ebvRxC1sosn8/JPtNEUHKWtij6eLTg8BuNYleevlwwJ41X9MVDqdDuSUbMIqtFqNqwPxDWsyak2wn8OYWBqeeRzTqI8v/iJUUpA8+2jr4jZw+3i3ZH1UTtaqQ2/2z67r9VjqyiYdlex2Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=qphfVBqT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="qphfVBqT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1ED14C4CEF7; Mon, 9 Mar 2026 20:24:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1773087873; bh=RHSsmc9nYmI9FyP2Z4aoYEmwjnRG71zaeGl7rvaM7kA=; h=Date:To:From:Subject:From; b=qphfVBqTMkSuErrUmKRNiVREzEtvldq38QTKtbhDfhQtRm+B0jN/QnzHNQFMCwVVv XNPgEISnZlMDC/jH056HMDXhIu2HqRiYdRVG5VSCJatwSv+X7Gf5U4od0M5Gu/mmHv M/UOQ+MG2eH4cOR/OhiO/MlJ0GBY7jlutzaIZdBs= Date: Mon, 09 Mar 2026 13:24:32 -0700 To: mm-commits@vger.kernel.org,objecting@objecting.org,akpm@linux-foundation.org From: Andrew Morton Subject: + lib-ts_kmp-fix-integer-overflow-in-pattern-length-calculation.patch added to mm-nonmm-unstable branch Message-Id: <20260309202433.1ED14C4CEF7@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: lib/ts_kmp: fix integer overflow in pattern length calculation has been added to the -mm mm-nonmm-unstable branch. Its filename is lib-ts_kmp-fix-integer-overflow-in-pattern-length-calculation.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/lib-ts_kmp-fix-integer-overflow-in-pattern-length-calculation.patch This patch will later appear in the mm-nonmm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Josh Law Subject: lib/ts_kmp: fix integer overflow in pattern length calculation Date: Sun, 8 Mar 2026 20:20:28 +0000 The ts_kmp algorithm stores its prefix_tbl[] table and pattern in a single allocation sized from the pattern length. If the prefix_tbl[] size calculation wraps, the resulting allocation can be too small and subsequent pattern copies can overflow it. Fix this by rejecting zero-length patterns and by using overflow helpers before calculating the combined allocation size. Link: https://lkml.kernel.org/r/20260308202028.2889285-2-objecting@objecting.org Signed-off-by: Josh Law Signed-off-by: Andrew Morton --- lib/ts_kmp.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) --- a/lib/ts_kmp.c~lib-ts_kmp-fix-integer-overflow-in-pattern-length-calculation +++ a/lib/ts_kmp.c @@ -94,8 +94,22 @@ static struct ts_config *kmp_init(const struct ts_config *conf; struct ts_kmp *kmp; int i; - unsigned int prefix_tbl_len = len * sizeof(unsigned int); - size_t priv_size = sizeof(*kmp) + len + prefix_tbl_len; + unsigned int prefix_tbl_len; + size_t priv_size; + + /* Zero-length patterns would make kmp_find() read beyond kmp->pattern. */ + if (unlikely(!len)) + return ERR_PTR(-EINVAL); + + /* + * kmp->pattern is stored immediately after the prefix_tbl[] table. + * Reject lengths that would wrap while sizing either region. + */ + if (unlikely(check_mul_overflow(len, sizeof(*kmp->prefix_tbl), + &prefix_tbl_len) || + check_add_overflow(sizeof(*kmp), (size_t)len, &priv_size) || + check_add_overflow(priv_size, prefix_tbl_len, &priv_size))) + return ERR_PTR(-EINVAL); conf = alloc_ts_config(priv_size, gfp_mask); if (IS_ERR(conf)) _ Patches currently in -mm which might be from objecting@objecting.org are lib-maple_tree-fix-swapped-arguments-in-mas_safe_pivot-call.patch lib-glob-fix-grammar-and-replace-non-inclusive-terminology.patch lib-glob-add-explicit-include-for-exporth.patch lib-glob-replace-bitwise-or-with-logical-operation-on-boolean.patch lib-glob-clean-up-bool-abuse-in-pointer-arithmetic.patch lib-uuid-fix-typo-reversion-to-revision-in-comment.patch lib-inflate-fix-memory-leak-in-inflate_fixed-on-inflate_codes-failure.patch lib-inflate-fix-memory-leak-in-inflate_dynamic-on-inflate_codes-failure.patch lib-inflate-fix-grammar-in-comment-variable-to-variables.patch lib-inflate-fix-typo-this-results-to-the-results-in-comment.patch lib-bug-fix-inconsistent-capitalization-in-bug-message.patch lib-bug-remove-unnecessary-variable-initializations.patch lib-idr-fix-ida_find_first_range-missing-ids-across-chunk-boundaries.patch lib-decompress_bunzip2-fix-32-bit-shift-undefined-behavior.patch maintainers-add-josh-law-as-reviewer-for-library-code.patch lib-bootconfig-fix-typo-budy-in-_xbc_exit-comment.patch lib-ts_bm-fix-integer-overflow-in-pattern-length-calculation.patch lib-ts_kmp-fix-integer-overflow-in-pattern-length-calculation.patch