[PATCH uci 2/6] file: uci_parse_package: fix heap use after free
Petr Štetiar
ynezz at true.cz
Sat Oct 3 03:48:26 EDT 2020
Fixes following issue which is caused by usage of pointer which pointed
to a reallocated address:
ERROR: AddressSanitizer: heap-use-after-free on address 0x619000000087 at pc 0x000000509aa7 bp 0x7ffd6b9c3c40 sp 0x7ffd6b9c3400
READ of size 2 at 0x619000000087 thread T0
#0 0x509aa6 in strdup (test-fuzz+0x509aa6)
#1 0x7fc36d2a1636 in uci_strdup util.c:60:8
#2 0x7fc36d29e1ac in uci_alloc_generic list.c:55:13
#3 0x7fc36d29e241 in uci_alloc_package list.c:253:6
#4 0x7fc36d2a0ba3 in uci_switch_config file.c:375:18
#5 0x7fc36d2a09b8 in uci_parse_package file.c:397:2
#6 0x7fc36d2a09b8 in uci_parse_line file.c:513:6
#7 0x7fc36d2a09b8 in uci_import file.c:681:4
0x619000000087 is located 7 bytes inside of 1024-byte region [0x619000000080,0x619000000480)
freed by thread T0 here:
#0 0x51daa9 in realloc (test-fuzz+0x51daa9)
#1 0x7fc36d2a1612 in uci_realloc util.c:49:8
previously allocated by thread T0 here:
#0 0x51daa9 in realloc (test-fuzz+0x51daa9)
#1 0x7fc36d2a1612 in uci_realloc util.c:49:8
Reported-by: Jeremy Galindo <jgalindo at datto.com>
Signed-off-by: Petr Štetiar <ynezz at true.cz>
---
file.c | 2 +-
...sig-06,src-000079,time-22005942,op-ext_AO,pos-8 | Bin 0 -> 56 bytes
2 files changed, 1 insertion(+), 1 deletion(-)
create mode 100644 tests/fuzz/corpus/id-000000,sig-06,src-000079,time-22005942,op-ext_AO,pos-8
diff --git a/file.c b/file.c
index 6486de9c4229..23bf49a16f63 100644
--- a/file.c
+++ b/file.c
@@ -388,8 +388,8 @@ static void uci_parse_package(struct uci_context *ctx, bool single)
pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
ofs_name = next_arg(ctx, true, true, true);
- name = pctx_str(pctx, ofs_name);
assert_eol(ctx);
+ name = pctx_str(pctx, ofs_name);
if (single)
return;
diff --git a/tests/fuzz/corpus/id-000000,sig-06,src-000079,time-22005942,op-ext_AO,pos-8 b/tests/fuzz/corpus/id-000000,sig-06,src-000079,time-22005942,op-ext_AO,pos-8
new file mode 100644
index 0000000000000000000000000000000000000000..dc92b9dbb1ea9a540d60176c97ee9803c42dd3bf
GIT binary patch
literal 56
zcmXR&OwLYBPgN*@(lHFFjAeOc1$jzbTncy18yFZE5{noZKdkG_3=k<=xL-@**{y7@
Go{s<;LKIT~
literal 0
HcmV?d00001
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