From: "Hailong.Liu" hailong.liu@oppo.com
mainline inclusion from mainline-v6.9-rc8 commit ac0476e8ca2e4125c0886d7d8d418b8e7cb17139 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9OCYO CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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vm_map_ram() uses IS_ERR() to validate the return value of vb_alloc(). If vm_map_ram(page, 0, 0) is executed, vb_alloc(0, GFP_KERNEL) would return NULL. In such a case, IS_ERR() cannot handle the return value and lead to kernel panic by vmap_pages_range_noflush() at last. To resolve this issue, return ERR_PTR(-EINVAL) if the size is 0.
Link: https://lkml.kernel.org/r/20240426024149.21176-1-hailong.liu@oppo.com Reviewed-by: Barry Song baohua@kernel.org Reviewed-by: Uladzislau Rezki (Sony) urezki@gmail.com Signed-off-by: Hailong.Liu hailong.liu@oppo.com Reviewed-by: Christoph Hellwig hch@lst.de Cc: Lorenzo Stoakes lstoakes@gmail.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Liu Shixin liushixin2@huawei.com --- mm/vmalloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index e8a66a0dcb57..e6058942a084 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2694,7 +2694,7 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask) * get_order(0) returns funny result. Just warn and terminate * early. */ - return NULL; + return ERR_PTR(-EINVAL); } order = get_order(size);