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Cygwin: posix_fallocate(3): fix offset and length sanity check

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- len must not be <= 0
- offset + len must not exceed off_t (max. file size)

Fixes: 7636b5859062 ("* autoload.cc (NtSetInformationFile): Define.")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2023-12-05 22:08:01 +01:00
parent 14d786873c
commit 295bef07d6
1 changed files with 3 additions and 1 deletions
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4
winsup/cygwin/syscalls.cc
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@ -3030,8 +3030,10 @@ extern "C" int
posix_fallocate (int fd, off_t offset, off_t len)
{
int res = 0;
if (offset < 0 || len == 0)
if (offset < 0 || len <= 0)
res = EINVAL;
else if (INT64_MAX - len < offset)
res = EFBIG;
else
{
cygheap_fdget cfd (fd);