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devres: Fix devm_krealloc() wasting memory

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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@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zijun Hu 2024-07-02 22:51:50 +08:00 committed by Ksawlii
parent 95a3291454
commit f77fd98aaa
1 changed files with 4 additions and 1 deletions
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5
drivers/base/devres.c
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@ -901,9 +901,12 @@ void *devm_krealloc(struct device *dev, void *ptr, size_t new_size, gfp_t gfp)
/*
* 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;