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powerpc/pseries: Fix potential memleak in papr_get_attr()

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`buf` is allocated in papr_get_attr(), and krealloc() of `buf`
could fail. We need to free the original `buf` in the case of failure.

Fixes: 3c14b73454 ("powerpc/pseries: Interface to represent PAPR firmware attributes")
Signed-off-by: Qiheng Lin <linqiheng@huawei.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20221208133449.16284-1-linqiheng@huawei.com
This commit is contained in:
Qiheng Lin 2022-12-08 21:34:49 +08:00 committed by Michael Ellerman
parent 6035e7e354
commit cda9c0d556
1 changed files with 5 additions and 3 deletions
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8
arch/powerpc/platforms/pseries/papr_platform_attributes.c
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@ -101,10 +101,12 @@ static int papr_get_attr(u64 id, struct energy_scale_attribute *esi)
esi_buf_size = ESI_HDR_SIZE + (CURR_MAX_ESI_ATTRS * max_esi_attrs);
temp_buf = krealloc(buf, esi_buf_size, GFP_KERNEL);
if (temp_buf)
if (temp_buf) {
buf = temp_buf;
else
return -ENOMEM;
} else {
ret = -ENOMEM;
goto out_buf;
}
goto retry;
}