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iommu/iova: Add NULL check in iova_magazine_free()

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When iova_domain_init_rcaches() fails to allocate an iova_magazine
during the initialization of per-cpu rcaches, it jumps to out_err and
calls free_iova_rcaches() for cleanup.

In free_iova_rcaches(), the code iterates through all possible CPUs to
free both cpu_rcache->loaded and cpu_rcache->prev. However, if the
original allocation failed mid-way through the CPU loop, the pointers
for the remaining CPUs remain NULL.

Since kmem_cache_free() does not explicitly handle NULL pointers like
kfree() does, passing these NULL pointers leads to a kernel paging
request fault.

Add a NULL check in iova_magazine_free() to safely handle partially
initialized rcaches in error paths.

Signed-off-by: lynn <liulynn@google.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
lynn 2026-02-14 08:09:19 +00:00 committed by Joerg Roedel
parent 199036ae01
commit fa8fb60d36
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/iova.c
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@ -611,7 +611,8 @@ static struct iova_magazine *iova_magazine_alloc(gfp_t flags)
static void iova_magazine_free(struct iova_magazine *mag)
{
kmem_cache_free(iova_magazine_cache, mag);
if (mag)
kmem_cache_free(iova_magazine_cache, mag);
}
static void