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infra: fix mapfree use-after-free

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This commit is contained in:
Thomas Schoebel-Theuer 2020-09-15 02:49:22 +02:00
parent 7397a8febd
commit 2231b50d04
1 changed files with 4 additions and 2 deletions
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6
kernel/lib_mapfree.c
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@ -146,9 +146,11 @@ void _mapfree_put(struct mapfree_info *mf)
void mapfree_put(struct mapfree_info *mf)
{
if (likely(mf && mf->mf_hash < MAPFREE_HASH)) {
down_write(&mf_table[mf->mf_hash].hash_mutex);
unsigned int hash = mf->mf_hash;
down_write(&mf_table[hash].hash_mutex);
_mapfree_put(mf);
up_write(&mf_table[mf->mf_hash].hash_mutex);
up_write(&mf_table[hash].hash_mutex);
}
}
EXPORT_SYMBOL_GPL(mapfree_put);