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mapfree: safeguard calling conventions

This commit is contained in:
Thomas Schoebel-Theuer 2021-11-03 14:44:17 +01:00
parent a8039c4a70
commit 3bd3d9b269
1 changed files with 30 additions and 13 deletions
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29
kernel/lib_mapfree.c
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@ -154,13 +154,20 @@ void _mapfree_put(struct mapfree_info *mf)
void mapfree_put(struct mapfree_info *mf)
{
if (likely(mf && mf->mf_hash < MAPFREE_HASH)) {
unsigned int hash = mf->mf_hash;
unsigned int hash;
if (unlikely(!mf))
return;
hash = mf->mf_hash;
if (unlikely(hash >= MAPFREE_HASH)) {
MARS_ERR("Bad mapfree hash %d\n", hash);
return;
}
down_write(&mf_table[hash].hash_mutex);
_mapfree_put(mf);
up_write(&mf_table[hash].hash_mutex);
}
}
EXPORT_SYMBOL_GPL(mapfree_put);
@ -334,8 +341,19 @@ EXPORT_SYMBOL_GPL(mapfree_get);
void mapfree_set(struct mapfree_info *mf, loff_t min, loff_t max)
{
if (likely(mf && mf->mf_hash < MAPFREE_HASH)) {
struct mf_hash_anchor *mha = &mf_table[mf->mf_hash];
struct mf_hash_anchor *mha;
unsigned int hash;
if (unlikely(!mf))
return;
hash = mf->mf_hash;
if (unlikely(hash >= MAPFREE_HASH)) {
MARS_ERR("Bad mapfree hash %d\n", hash);
return;
}
mha = &mf_table[hash];
down_write(&mha->hash_mutex);
if (!mf->mf_min[0] || mf->mf_min[0] > min)
@ -343,7 +361,6 @@ void mapfree_set(struct mapfree_info *mf, loff_t min, loff_t max)
if (max >= 0 && mf->mf_max < max)
mf->mf_max = max;
up_write(&mha->hash_mutex);
}
}
EXPORT_SYMBOL_GPL(mapfree_set);