From: VanGiang Nguyen <vangiang.nguyen@rohde-schwarz.com> stable inclusion from stable-v5.10.227 commit 46c4079460f4dcaf445860679558eedef4e1bc91 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYQSB CVE: CVE-2024-47739 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit 9a22b2812393d93d84358a760c347c21939029a6 upstream. When submitting more than 2^32 padata objects to padata_do_serial, the current sorting implementation incorrectly sorts padata objects with overflowed seq_nr, causing them to be placed before existing objects in the reorder list. This leads to a deadlock in the serialization process as padata_find_next cannot match padata->seq_nr and pd->processed because the padata instance with overflowed seq_nr will be selected next. To fix this, we use an unsigned integer wrap around to correctly sort padata objects in scenarios with integer overflow. Fixes: bfde23ce200e ("padata: unbind parallel jobs from specific CPUs") Cc: <stable@vger.kernel.org> Co-developed-by: Christian Gafert <christian.gafert@rohde-schwarz.com> Signed-off-by: Christian Gafert <christian.gafert@rohde-schwarz.com> Co-developed-by: Max Ferger <max.ferger@rohde-schwarz.com> Signed-off-by: Max Ferger <max.ferger@rohde-schwarz.com> Signed-off-by: Van Giang Nguyen <vangiang.nguyen@rohde-schwarz.com> Acked-by: Daniel Jordan <daniel.m.jordan@oracle.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Conflicts: kernel/padata.c [Conflicts due to 7033f87927d5 ("padata: Fix list iterator in padata_do_serial()") not merged.] Signed-off-by: Cheng Yu <serein.chengyu@huawei.com> --- kernel/padata.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/padata.c b/kernel/padata.c index 915945c932db..09e6207048aa 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -404,9 +404,11 @@ void padata_do_serial(struct padata_priv *padata) spin_lock(&reorder->lock); /* Sort in ascending order of sequence number. */ - list_for_each_entry_reverse(cur, &reorder->list, list) - if (cur->seq_nr < padata->seq_nr) + list_for_each_entry_reverse(cur, &reorder->list, list) { + /* Compare by difference to consider integer wrap around */ + if ((signed int)(cur->seq_nr - padata->seq_nr) < 0) break; + } list_add(&padata->list, &cur->list); spin_unlock(&reorder->lock); -- 2.25.1