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| author | Thomas Gleixner <tglx@linutronix.de> | 2018-04-04 12:40:07 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-04-06 12:19:50 +0200 |
| commit | 0211e12dd0a5385ecffd3557bc570dbad7fcf245 (patch) | |
| tree | 7565018404d1075b968f69ee4e90b2bf5b9cf981 | |
| parent | 83fbdf1c0595470d98ee99a6474099aee870640f (diff) | |
| download | linux-0211e12dd0a5385ecffd3557bc570dbad7fcf245.tar.gz linux-0211e12dd0a5385ecffd3557bc570dbad7fcf245.tar.bz2 linux-0211e12dd0a5385ecffd3557bc570dbad7fcf245.zip | |
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@linutronix.de>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Ming Lei <ming.lei@redhat.com>
| -rw-r--r-- | kernel/irq/affinity.c | 15 |
1 files 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; } |