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authorBen Collins <ben.collins@ubuntu.com>2007-05-23 13:57:43 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-23 20:14:12 -0700
commit3c6df2a9177c010bf811c361149069e4bfd9bb11 (patch)
tree151ece2576e9e2481057bc0107aba8c0cc864384 /arch/x86_64
parent6754bb4de94098a0aaa23a600f0edb9a9454c252 (diff)
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 <bcollins@ubuntu.com> Cc: Andi Kleen <ak@suse.de> Cc: Dave Jones <davej@codemonkey.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/kernel/k8.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/k8.c b/arch/x86_64/kernel/k8.c
index bc11b32e8b4d..7377ccb21335 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);