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Validate lbat element length on read

This commit is contained in:
Tom Marshall 2019-11-16 20:29:06 -08:00
parent f1bb01ab48
commit 9f9722bb26
1 changed files with 6 additions and 0 deletions
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6
dm-compress/lbd.c
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@ -431,6 +431,12 @@ lbd_read(struct lbd* lbd)
nr_pblk = (lbd->c_len == CBD_UNCOMPRESSED) ?
lblk_per_pblk(&lbd->kparams->params) :
DIV_ROUND_UP(lbd->c_len, pblk_size(&lbd->kparams->params));
if (nr_pblk > lblk_per_pblk(&lbd->kparams->params)) {
printk(KERN_ERR "%s: elem len %u out of range at lblk=%lu\n",
__func__, lbd->c_len, (unsigned long)lbd->lblk);
ret = -EIO;
goto out;
}
for (pblk_idx = 0, pg_idx = 0; pblk_idx < nr_pblk; ++pg_idx) {
iov_len = min(nr_pblk - pblk_idx, pblk_per_page);
for (n = 0; n < iov_len; ++n) {