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Issue #9758: When fcntl.ioctl() was called with mutable_flag set to True,

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and the passed buffer was exactly 1024 bytes long, the buffer wouldn't
be updated back after the system call.  Original patch by Brian Brazil.
This commit is contained in:
Antoine Pitrou 2010-09-07 16:30:09 +00:00
parent 7f7561ebfc
commit 5e38aae91b
3 changed files with 31 additions and 6 deletions
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2
Modules/fcntlmodule.c
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@ -157,7 +157,7 @@ fcntl_ioctl(PyObject *self, PyObject *args)
else {
ret = ioctl(fd, code, arg);
}
if (mutate_arg && (len < IOCTL_BUFSZ)) {
if (mutate_arg && (len <= IOCTL_BUFSZ)) {
memcpy(str, buf, len);
}
PyBuffer_Release(&pstr); /* No further access to str below this point */