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powerpc/iommu: fix memory leak with using debugfs_lookup()

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[ Upstream commit b505063910 ]

When calling debugfs_lookup() the result must have dput() called on it,
otherwise the memory will leak over time.  To make things simpler, just
call debugfs_lookup_and_remove() instead which handles all of the logic
at once.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230202141919.2298821-1-gregkh@linuxfoundation.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Greg Kroah-Hartman 2023-02-02 15:19:19 +01:00
parent 93aa548a33
commit e3a62a35f9
1 changed files with 1 additions and 3 deletions
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4
arch/powerpc/kernel/iommu.c
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@ -68,11 +68,9 @@ static void iommu_debugfs_add(struct iommu_table *tbl)
static void iommu_debugfs_del(struct iommu_table *tbl)
{
char name[10];
struct dentry *liobn_entry;
sprintf(name, "%08lx", tbl->it_index);
liobn_entry = debugfs_lookup(name, iommu_debugfs_dir);
debugfs_remove(liobn_entry);
debugfs_lookup_and_remove(name, iommu_debugfs_dir);
}
#else
static void iommu_debugfs_add(struct iommu_table *tbl){}