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notify: don't close FD 0

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This fixes a regression where closing a terminal instance, or hard- or
soft-resetting a terminal caused FD 0 to be closed.

This meant it became re-usable. Usually, by memfd_create() when
allocating a new surface buffer. So far nothing _really_ bad has
happened.

But what if FD 0 is now used by a memfd, and we close _another_
terminal instance?

This causes our memfd to be closed. And then, when e.g. trying to
scroll the terminal content: fallocate() fails with bad FD.
This commit is contained in:
Daniel Eklöf 2024-07-30 16:33:19 +02:00
parent a3ad740251
commit 0a5ba708e4
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3 changed files with 11 additions and 4 deletions
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shm.c
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@ -255,7 +255,7 @@ instantiate_offset(struct buffer_private *buf, off_t new_offset)
void *mmapped = MAP_FAILED;
struct wl_buffer *wl_buf = NULL;
pixman_image_t **pix = xcalloc(buf->public.pix_instances, sizeof(*pix));
pixman_image_t **pix = xcalloc(buf->public.pix_instances, sizeof(pix[0]));
mmapped = (uint8_t *)pool->real_mmapped + new_offset;