From 7f88c8e0b316e7832e58ff878cffb62460b2902f Mon Sep 17 00:00:00 2001 From: Corinna Vinschen Date: Tue, 5 Dec 2023 22:08:42 +0100 Subject: Cygwin: fallocate(2): fix offset and length sanity check - len must not be <= 0 - offset + len must not exceed off_t (max. file size) Fixes: e01c50c7b0a6 ("Cygwin: introduce fallocate(2)") Signed-off-by: Corinna Vinschen --- winsup/cygwin/syscalls.cc | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'winsup') diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc index 3edb55bc6..b6aeb47c8 100644 --- a/winsup/cygwin/syscalls.cc +++ b/winsup/cygwin/syscalls.cc @@ -3005,8 +3005,10 @@ fallocate (int fd, int mode, off_t offset, off_t len) else if ((mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)) == FALLOC_FL_PUNCH_HOLE) res = EOPNOTSUPP; - else if (offset < 0 || len == 0) + else if (offset < 0 || len <= 0) res = EINVAL; + else if (INT64_MAX - len < offset) + res = EFBIG; else { cygheap_fdget cfd (fd); -- cgit v1.2.3