* [committed] Fix segfault in die_cu
@ 2020-01-01 0:00 Tom de Vries
0 siblings, 0 replies; only message in thread
From: Tom de Vries @ 2020-01-01 0:00 UTC (permalink / raw)
To: dwz, jakub
Hi,
When running dwz in normal mode, we get an error:
...
$ dwz clang-offload-bundler-10.debug -lnone
dwz: clang-offload-bundler-10.debug: Couldn't find DIE referenced by \
DW_OP_GNU_implicit_pointer
...
but when forcing low-mem mode, we get a segfault:
...
$ dwz clang-offload-bundler-10.debug -l0
Segmentation fault (core dumped)
...
In normal mode, we hit the error here:
...
ref = off_htab_lookup (NULL, addr);
if (ref == NULL)
{
error (0, 0, "%s: Couldn't find DIE referenced by %s",
dso->filename, get_DW_OP_str (op));
...
but for low-mem mode, this doesn't trigger, because we find the dummy DIE that
has been added by read_exprloc_low_mem_phase1.
Fix this by testing for the dummy DIE in the error condition:
...
- if (ref == NULL)
+ if (ref == NULL || (unlikely (low_mem) && ref->die_tag == 0))
...
Committed to trunk.
Thanks,
- Tom
Fix segfault in die_cu
2020-01-24 Tom de Vries <tdevries@suse.de>
PR dwz/25456
* dwz.c (read_exprloc): Test for dummy DIE in error condition.
---
dwz.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/dwz.c b/dwz.c
index b12645d..a81e42a 100644
--- a/dwz.c
+++ b/dwz.c
@@ -1902,7 +1902,7 @@ read_exprloc (DSO *dso, dw_die_ref die, unsigned char *ptr, size_t len,
else
ptr += 4;
ref = off_htab_lookup (NULL, addr);
- if (ref == NULL)
+ if (ref == NULL || (unlikely (low_mem) && ref->die_tag == 0))
{
error (0, 0, "%s: Couldn't find DIE referenced by %s",
dso->filename, get_DW_OP_str (op));
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2020-01-01 0:00 [committed] Fix segfault in die_cu Tom de Vries
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