File 0001-fix-obj_flush_hdlstream-GH-497.patch of Package libredwg
From 2f36577e6ef6a32c81be48a6faac303f76f6f943 Mon Sep 17 00:00:00 2001
From: Reini Urban <rurban@cpan.org>
Date: Mon, 15 Aug 2022 11:06:14 +0200
Subject: [PATCH] fix obj_flush_hdlstream GH #497
don't free non-temp hdl_dat chain, when it's the dat->chain really.
(on old DWG's)
---
src/encode.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/src/encode.c b/src/encode.c
index d4a63e16..1b82dd2a 100644
--- a/src/encode.c
+++ b/src/encode.c
@@ -823,9 +823,11 @@ const unsigned char unknown_section[53]
bit_chain_init_dat (&dat2, 12, dat); \
hdl_dat = &dat2; \
ENCODE_COMMON_HANDLES \
+ bit_set_position (hdl_dat, 0); \
obj_flush_hdlstream (obj, dat, hdl_dat); /* common */ \
obj_flush_hdlstream (obj, dat, &dat1); /* special accumulated */ \
- bit_chain_free (&dat1); \
+ if (dat1.chain != dat->chain) \
+ bit_chain_free (&dat1); \
bit_chain_free (&dat2); \
*hdl_dat = *dat; \
hdl_dat = dat; \
@@ -855,7 +857,12 @@ obj_flush_hdlstream (Dwg_Object *restrict obj, Bit_Chain *restrict dat,
hdl_dat->byte, hdl_dat->bit, (datpos - objpos) / 8,
(datpos - objpos) % 8);
if (hdlpos > 10000U)
- LOG_ERROR("Possible hdl_data overflow")
+ LOG_WARN("Possible hdl_data overflow")
+ if (dat->chain == hdl_dat->chain)
+ {
+ LOG_WARN("Ignore identical hdl chains")
+ return;
+ }
// This might change dat->chain
bit_copy_chain (dat, hdl_dat);
}
--
2.37.1
