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ubifs: Fix memory leak on error condition 

If the call to ubifs_read_nnode() fails in ubifs_lpt_calc_hash() an
error is returned without freeing the memory allocated to 'buf'.
Read and check the root node before allocating the buffer.

Detected by CoverityScan, CID 1441025 ("Resource leak")

Signed-off-by: Garry McNulty <garrmcnu@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Garry McNulty 2018-11-15 22:25:58 +00:00 committed by Richard Weinberger
parent 60eb5da243
commit 6554a56f35
1 changed files with 6 additions and 6 deletions
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12
fs/ubifs/lpt.c
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@ -1675,6 +1675,12 @@ int ubifs_lpt_calc_hash(struct ubifs_info *c, u8 *hash)
if (!ubifs_authenticated(c))
return 0;
if (!c->nroot) {
err = ubifs_read_nnode(c, NULL, 0);
if (err)
return err;
}
desc = ubifs_hash_get_desc(c);
if (IS_ERR(desc))
return PTR_ERR(desc);
@ -1685,12 +1691,6 @@ int ubifs_lpt_calc_hash(struct ubifs_info *c, u8 *hash)
goto out;
}
if (!c->nroot) {
err = ubifs_read_nnode(c, NULL, 0);
if (err)
return err;
}
cnode = (struct ubifs_cnode *)c->nroot;
while (cnode) {