From 3c6df2a9177c010bf811c361149069e4bfd9bb11 Mon Sep 17 00:00:00 2001 From: Ben Collins Date: Wed, 23 May 2007 13:57:43 -0700 Subject: [PATCH] Avoid zero size allocation in cache_k8_northbridges() kmalloc for flush_words resulted in zero size allocation when no k8_northbridges existed. Short circuit the code path for this case. Also remove uneeded zeroing of num_k8_northbridges just after checking if it is zero. Signed-off-by: Ben Collins Cc: Andi Kleen Cc: Dave Jones Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/x86_64/kernel/k8.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/x86_64/kernel/k8.c b/arch/x86_64/kernel/k8.c index bc11b32e8b..7377ccb213 100644 --- a/arch/x86_64/kernel/k8.c +++ b/arch/x86_64/kernel/k8.c @@ -39,10 +39,10 @@ int cache_k8_northbridges(void) { int i; struct pci_dev *dev; + if (num_k8_northbridges) return 0; - num_k8_northbridges = 0; dev = NULL; while ((dev = next_k8_northbridge(dev)) != NULL) num_k8_northbridges++; @@ -52,6 +52,11 @@ int cache_k8_northbridges(void) if (!k8_northbridges) return -ENOMEM; + if (!num_k8_northbridges) { + k8_northbridges[0] = NULL; + return 0; + } + flush_words = kmalloc(num_k8_northbridges * sizeof(u32), GFP_KERNEL); if (!flush_words) { kfree(k8_northbridges); -- 2.39.5