This is a note to let you know that I've just added the patch titled
powerpc/iommu: fix memory leak with using debugfs_lookup()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-iommu-fix-memory-leak-with-using-debugfs_loo.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bb86e9216302b27f7e83a8a01ad5a491a9754fd6
Author: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Date: Thu Feb 2 15:19:19 2023 +0100
powerpc/iommu: fix memory leak with using debugfs_lookup()
[ Upstream commit b505063910c134778202dfad9332dfcecb76bab3 ]
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@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230202141919.2298821-1-gregkh@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index a67fd54ccc573..8bea336fa5b70 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -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){}
