lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Wed, 11 Apr 2018 10:34:39 +0800 From: Jia-Ju Bai <baijiaju1990@...il.com> To: asun@...ksunrising.com Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com> Subject: [PATCH] net: sun: cassini: Replace GFP_ATOMIC with GFP_KERNEL in cas_check_invariants cas_check_invariants() is never called in atomic context. cas_check_invariants() is only called by cas_init_one(), which is only set as ".probe" in struct pci_driver. Despite never getting called from atomic context, cas_check_invariants() calls alloc_pages() with GFP_ATOMIC, which does not sleep for allocation. GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, which can sleep and improve the possibility of sucessful allocation. This is found by a static analysis tool named DCNS written by myself. And I also manually check it. Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com> --- drivers/net/ethernet/sun/cassini.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/sun/cassini.c b/drivers/net/ethernet/sun/cassini.c index 382993c..4dd38e3 100644 --- a/drivers/net/ethernet/sun/cassini.c +++ b/drivers/net/ethernet/sun/cassini.c @@ -3412,7 +3412,7 @@ static int cas_check_invariants(struct cas *cp) #ifdef USE_PAGE_ORDER if (PAGE_SHIFT < CAS_JUMBO_PAGE_SHIFT) { /* see if we can allocate larger pages */ - struct page *page = alloc_pages(GFP_ATOMIC, + struct page *page = alloc_pages(GFP_KERNEL, CAS_JUMBO_PAGE_SHIFT - PAGE_SHIFT); if (page) { -- 1.9.1
Powered by blists - more mailing lists