From: Kunwu Chan <chentao@xxxxxxxxxx> [ Upstream commit f46c8a75263f97bda13c739ba1c90aced0d3b071 ] 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@xxxxxxxxxx> Suggested-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Signed-off-by: Kunwu Chan <chentao@xxxxxxxxxx> Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Link: https://msgid.link/20231204023223.2447523-1-chentao@xxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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 2b656e67f2ea..927703af49be 100644 --- a/arch/powerpc/mm/init-common.c +++ b/arch/powerpc/mm/init-common.c @@ -65,7 +65,7 @@ void pgtable_cache_add(unsigned shift, void (*ctor)(void *)) * 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 @@ -78,7 +78,8 @@ void pgtable_cache_add(unsigned shift, void (*ctor)(void *)) 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); + if (name) + new = kmem_cache_create(name, table_size, align, 0, ctor); if (!new) panic("Could not allocate pgtable cache for order %d", shift); -- 2.43.0
