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linux(4): readlink should fail if bufzis <= 0.

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MFC after:		2 weeks
This commit is contained in:
Dmitry Chagin 2022-03-31 21:21:41 +03:00
parent b7df7b987e
commit d6ccce0aa2
1 changed files with 6 additions and 0 deletions
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6
sys/compat/linux/linux_file.c
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@ -1042,6 +1042,9 @@ linux_readlink(struct thread *td, struct linux_readlink_args *args)
char *name;
int error;
if (args->count <= 0)
return (EINVAL);
if (!LUSECONVPATH(td)) {
return (kern_readlinkat(td, AT_FDCWD, args->name, UIO_USERSPACE,
args->buf, UIO_USERSPACE, args->count));
@ -1060,6 +1063,9 @@ linux_readlinkat(struct thread *td, struct linux_readlinkat_args *args)
char *name;
int error, dfd;
if (args->bufsiz <= 0)
return (EINVAL);
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
if (!LUSECONVPATH(td)) {
return (kern_readlinkat(td, dfd, args->path, UIO_USERSPACE,