From: Kunwu Chan chentao@kylinos.cn

mainline inclusion from mainline-v6.8-rc1 commit f46c8a75263f97bda13c739ba1c90aced0d3b071 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I96GP1 CVE: CVE-2023-52607

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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kasprintf() returns a pointer to dynamically allocated memory which can be NULL upon failure. Ensure the allocation was successful by checking the pointer validity.

Suggested-by: Christophe Leroy christophe.leroy@csgroup.eu Suggested-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Kunwu Chan chentao@kylinos.cn Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://msgid.link/20231204023223.2447523-1-chentao@kylinos.cn Signed-off-by: ZhangPeng zhangpeng362@huawei.com --- arch/powerpc/mm/init-common.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c index 119ef491f797..d3a7726ecf51 100644 --- a/arch/powerpc/mm/init-common.c +++ b/arch/powerpc/mm/init-common.c @@ -126,7 +126,7 @@ void pgtable_cache_add(unsigned int shift) * as to leave enough 0 bits in the address to contain it. */ unsigned long minalign = max(MAX_PGTABLE_INDEX_SIZE + 1, HUGEPD_SHIFT_MASK + 1); - struct kmem_cache *new; + struct kmem_cache *new = NULL;

/* It would be nice if this was a BUILD_BUG_ON(), but at the * moment, gcc doesn't seem to recognize is_power_of_2 as a @@ -139,7 +139,8 @@ void pgtable_cache_add(unsigned int shift)

align = max_t(unsigned long, align, minalign); name = kasprintf(GFP_KERNEL, "pgtable-2^%d", shift); - new = kmem_cache_create(name, table_size, align, 0, ctor(shift)); + if (name) + new = kmem_cache_create(name, table_size, align, 0, ctor(shift)); if (!new) panic("Could not allocate pgtable cache for order %d", shift);