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Cygwin: fallocate(2): 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: e01c50c7b0a6 ("Cygwin: introduce fallocate(2)")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2023-12-05 22:08:42 +01:00
parent 295bef07d6
commit 7f88c8e0b3
1 changed files with 3 additions and 1 deletions
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4
winsup/cygwin/syscalls.cc
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@ -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);