Commit-ID: 0211e12dd0a5385ecffd3557bc570dbad7fcf245
Gitweb: https://git.kernel.org/tip/0211e12dd0a5385ecffd3557bc570dbad7fcf245
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Wed, 4 Apr 2018 12:40:07 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 6 Apr 2018 12:19:50 +0200
genirq/affinity: Don't return with empty affinity masks on error
When the allocation of node_to_possible_cpumask fails, then
irq_create_affinity_masks() returns with a pointer to the empty affinity
masks array, which will cause malfunction.
Reorder the allocations so the masks array allocation comes last and every
failure path returns NULL.
Fixes: 9a0ef98e186d ("genirq/affinity: Assign vectors to all present CPUs")
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxx>
---
kernel/irq/affinity.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index a37a3b4b6342..e0665549af59 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -108,7 +108,7 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
int affv = nvecs - affd->pre_vectors - affd->post_vectors;
int last_affv = affv + affd->pre_vectors;
nodemask_t nodemsk = NODE_MASK_NONE;
- struct cpumask *masks;
+ struct cpumask *masks = NULL;
cpumask_var_t nmsk, *node_to_possible_cpumask;
/*
@@ -121,13 +121,13 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL))
return NULL;
- masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL);
- if (!masks)
- goto out;
-
node_to_possible_cpumask = alloc_node_to_possible_cpumask();
if (!node_to_possible_cpumask)
- goto out;
+ goto outcpumsk;
+
+ masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL);
+ if (!masks)
+ goto outnodemsk;
/* Fill out vectors at the beginning that don't need affinity */
for (curvec = 0; curvec < affd->pre_vectors; curvec++)
@@ -192,8 +192,9 @@ done:
/* Fill out vectors at the end that don't need affinity */
for (; curvec < nvecs; curvec++)
cpumask_copy(masks + curvec, irq_default_affinity);
+outnodemsk:
free_node_to_possible_cpumask(node_to_possible_cpumask);
-out:
+outcpumsk:
free_cpumask_var(nmsk);
return masks;
}
--
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