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osmo_io: Assert osmo_iofd_set_alloc_info() params fit in a 16bit value

Related: SYS#7842
Change-Id: I32822574db8997a02bf18b71bf6ab596e726cb82
---
M src/core/osmo_io.c
1 file changed, 1 insertion(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/12/41912/1

diff --git a/src/core/osmo_io.c b/src/core/osmo_io.c
index d6cd57f..906e400 100644
--- a/src/core/osmo_io.c
+++ b/src/core/osmo_io.c
@@ -1068,6 +1068,7 @@
  */
 void osmo_iofd_set_alloc_info(struct osmo_io_fd *iofd, unsigned int size, unsigned int headroom)
 {
+	OSMO_ASSERT(size + headroom <= 0xffff);
 	iofd->msgb_alloc.headroom = headroom;
 	iofd->msgb_alloc.size = size;
 }

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