The quilt patch titled Subject: s390: kexec: initialize kexec_buf struct has been removed from the -mm tree. Its filename was s390-kexec-initialize-kexec_buf-struct.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------ From: Breno Leitao leitao@debian.org Subject: s390: kexec: initialize kexec_buf struct Date: Wed, 27 Aug 2025 03:42:23 -0700
The kexec_buf structure was previously declared without initialization. commit bf454ec31add ("kexec_file: allow to place kexec_buf randomly") added a field that is always read but not consistently populated by all architectures. This un-initialized field will contain garbage.
This is also triggering a UBSAN warning when the uninitialized data was accessed:
------------[ cut here ]------------ UBSAN: invalid-load in ./include/linux/kexec.h:210:10 load of value 252 is not a valid value for type '_Bool'
Zero-initializing kexec_buf at declaration ensures all fields are cleanly set, preventing future instances of uninitialized memory being used.
Link: https://lkml.kernel.org/r/20250827-kbuf_all-v1-3-1df9882bb01a@debian.org Fixes: bf454ec31add ("kexec_file: allow to place kexec_buf randomly") Signed-off-by: Breno Leitao leitao@debian.org Cc: Albert Ou aou@eecs.berkeley.edu Cc: Alexander Gordeev agordeev@linux.ibm.com Cc: Alexandre Ghiti alex@ghiti.fr Cc: Baoquan He bhe@redhat.com Cc: Catalin Marinas catalin.marinas@arm.com Cc: Christian Borntraeger borntraeger@linux.ibm.com Cc: Coiby Xu coxu@redhat.com Cc: Heiko Carstens hca@linux.ibm.com Cc: Palmer Dabbelt palmer@dabbelt.com Cc: Paul Walmsley paul.walmsley@sifive.com Cc: Sven Schnelle svens@linux.ibm.com Cc: Vasily Gorbik gor@linux.ibm.com Cc: Will Deacon will@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
arch/s390/kernel/kexec_elf.c | 2 +- arch/s390/kernel/kexec_image.c | 2 +- arch/s390/kernel/machine_kexec_file.c | 6 +++--- 3 files changed, 5 insertions(+), 5 deletions(-)
--- a/arch/s390/kernel/kexec_elf.c~s390-kexec-initialize-kexec_buf-struct +++ a/arch/s390/kernel/kexec_elf.c @@ -16,7 +16,7 @@ static int kexec_file_add_kernel_elf(struct kimage *image, struct s390_load_data *data) { - struct kexec_buf buf; + struct kexec_buf buf = {}; const Elf_Ehdr *ehdr; const Elf_Phdr *phdr; Elf_Addr entry; --- a/arch/s390/kernel/kexec_image.c~s390-kexec-initialize-kexec_buf-struct +++ a/arch/s390/kernel/kexec_image.c @@ -16,7 +16,7 @@ static int kexec_file_add_kernel_image(struct kimage *image, struct s390_load_data *data) { - struct kexec_buf buf; + struct kexec_buf buf = {};
buf.image = image;
--- a/arch/s390/kernel/machine_kexec_file.c~s390-kexec-initialize-kexec_buf-struct +++ a/arch/s390/kernel/machine_kexec_file.c @@ -129,7 +129,7 @@ static int kexec_file_update_purgatory(s static int kexec_file_add_purgatory(struct kimage *image, struct s390_load_data *data) { - struct kexec_buf buf; + struct kexec_buf buf = {}; int ret;
buf.image = image; @@ -152,7 +152,7 @@ static int kexec_file_add_purgatory(stru static int kexec_file_add_initrd(struct kimage *image, struct s390_load_data *data) { - struct kexec_buf buf; + struct kexec_buf buf = {}; int ret;
buf.image = image; @@ -184,7 +184,7 @@ static int kexec_file_add_ipl_report(str { __u32 *lc_ipl_parmblock_ptr; unsigned int len, ncerts; - struct kexec_buf buf; + struct kexec_buf buf = {}; unsigned long addr; void *ptr, *end; int ret; _
Patches currently in -mm which might be from leitao@debian.org are