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Avoid undefined behavior in 'send-process-region' (Bug#52369).

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* src/process.c (send_process): Signal an error if the file descriptor
has already been closed.
This commit is contained in:
Philipp Stephani 2021-12-11 13:51:34 +01:00
parent 30dd5c9acc
commit 8a0734329a
1 changed files with 3 additions and 0 deletions
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3
src/process.c
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@ -6520,6 +6520,9 @@ send_process (Lisp_Object proc, const char *buf, ptrdiff_t len,
/* Send this batch, using one or more write calls. */ /* Send this batch, using one or more write calls. */
ptrdiff_t written = 0; ptrdiff_t written = 0;
int outfd = p->outfd; int outfd = p->outfd;
if (outfd < 0)
error ("Output file descriptor of %s is closed",
SDATA (p->name));
eassert (0 <= outfd && outfd < FD_SETSIZE); eassert (0 <= outfd && outfd < FD_SETSIZE);
#ifdef DATAGRAM_SOCKETS #ifdef DATAGRAM_SOCKETS
if (DATAGRAM_CHAN_P (outfd)) if (DATAGRAM_CHAN_P (outfd))