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afs: Fix storage of cell names 

The cell name stored in the afs_cell struct is a 64-char + NUL buffer -
when it needs to be able to handle up to AFS_MAXCELLNAME (256 chars) + NUL.

Fix this by changing the array to a pointer and allocating the string.

Found using Coverity.

Fixes: 989782dcdc ("afs: Overhaul cell database management")
Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2020-06-24 17:00:24 +01:00 committed by Linus Torvalds
parent 916a3b0fc1
commit 719fdd3292
2 changed files with 10 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
fs/afs/cell.c
View File

@ -154,10 +154,17 @@ static struct afs_cell *afs_alloc_cell(struct afs_net *net,
return ERR_PTR(-ENOMEM);
}
cell->name = kmalloc(namelen + 1, GFP_KERNEL);
if (!cell->name) {
kfree(cell);
return ERR_PTR(-ENOMEM);
}
cell->net = net;
cell->name_len = namelen;
for (i = 0; i < namelen; i++)
cell->name[i] = tolower(name[i]);
cell->name[i] = 0;
atomic_set(&cell->usage, 2);
INIT_WORK(&cell->manager, afs_manage_cell);
@ -207,6 +214,7 @@ parse_failed:
if (ret == -EINVAL)
printk(KERN_ERR "kAFS: bad VL server IP address\n");
error:
kfree(cell->name);
kfree(cell);
_leave(" = %d", ret);
return ERR_PTR(ret);
@ -489,6 +497,7 @@ static void afs_cell_destroy(struct rcu_head *rcu)
afs_put_vlserverlist(cell->net, rcu_access_pointer(cell->vl_servers));
afs_put_cell(cell->net, cell->alias_of);
key_put(cell->anonymous_key);
kfree(cell->name);
kfree(cell);
_leave(" [destroyed]");

2
fs/afs/internal.h
View File

@ -388,7 +388,7 @@ struct afs_cell {
struct afs_vlserver_list __rcu *vl_servers;
u8 name_len; /* Length of name */
char name[64 + 1]; /* Cell name, case-flattened and NUL-padded */
char *name; /* Cell name, case-flattened and NUL-padded */
};
/*