diff options
author | Corinna Vinschen <corinna@vinschen.de> | 2023-12-06 00:08:42 +0300 |
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committer | Corinna Vinschen <corinna@vinschen.de> | 2023-12-06 00:20:42 +0300 |
commit | 7f88c8e0b316e7832e58ff878cffb62460b2902f (patch) | |
tree | 73aeebc1e1e2450389a192d78e076366415bb54d /winsup | |
parent | 295bef07d6bd18cd58746e46b400faadfb54b712 (diff) |
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 <corinna@vinschen.de>
Diffstat (limited to 'winsup')
-rw-r--r-- | winsup/cygwin/syscalls.cc | 4 |
1 files changed, 3 insertions, 1 deletions
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); |