5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>
commit c884e3249f753dcef7a2b2023541ac1dc46b318e upstream.
Driver API devm_krealloc() calls alloc_dr() with wrong argument
@total_new_size, so causes more memory to be allocated than required
fix this memory waste by using @new_size as the argument for alloc_dr().
Fixes: f82485722e5d ("devres: provide devm_krealloc()")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/1719931914-19035-2-git-send-email-quic_zijuhu@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/base/devres.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -890,9 +890,12 @@ void *devm_krealloc(struct device *dev,
/*
* Otherwise: allocate new, larger chunk. We need to allocate before
* taking the lock as most probably the caller uses GFP_KERNEL.
+ * alloc_dr() will call check_dr_size() to reserve extra memory
+ * for struct devres automatically, so size @new_size user request
+ * is delivered to it directly as devm_kmalloc() does.
*/
new_dr = alloc_dr(devm_kmalloc_release,
- total_new_size, gfp, dev_to_node(dev));
+ new_size, gfp, dev_to_node(dev));
if (!new_dr)
return NULL;
