5.15-stable review patch. If anyone has any objections, please let me know.
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From: Zijun Hu quic_zijuhu@quicinc.com
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@vger.kernel.org Signed-off-by: Zijun Hu quic_zijuhu@quicinc.com Link: https://lore.kernel.org/r/1719931914-19035-2-git-send-email-quic_zijuhu@quic... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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;