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linux(4): Fix listxattr for the case when the size is 0

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If size is specified as zero, these calls return the current size
of the list of extended attribute names (and leave list unchanged).

Tested by:		zirias
MFC after:		1 week

(cherry picked from commit 18d1c86788f66f42c4e096142f4f8d168f68732c)
This commit is contained in:
Dmitry Chagin 2023-09-05 11:51:46 +03:00
parent bce9c2e340
commit 53b3e15d73
1 changed files with 8 additions and 4 deletions
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12
sys/compat/linux/linux_xattr.c
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@ -173,24 +173,28 @@ listxattr(struct thread *td, struct listxattr_args *args)
while (rs > 0) {
keylen = (unsigned char)key[0];
pairlen = prefixlen + 1 + keylen + 1;
if (cnt + pairlen > LINUX_XATTR_LIST_MAX) {
cnt += pairlen;
if (cnt > LINUX_XATTR_LIST_MAX) {
error = E2BIG;
break;
}
if ((args->list != NULL && cnt > args->size) ||
/*
* If size is specified as zero, return the current size
* of the list of extended attribute names.
*/
if ((args->size > 0 && cnt > args->size) ||
pairlen >= sizeof(attrname)) {
error = ERANGE;
break;
}
++key;
if (args->list != NULL) {
if (args->list != NULL && args->size > 0) {
sprintf(attrname, "%s.%.*s", prefix, keylen, key);
error = copyout(attrname, args->list, pairlen);
if (error != 0)
break;
args->list += pairlen;
}
cnt += pairlen;
key += keylen;
rs -= (keylen + 1);
}