path: root/src/basic/string-util.c
diff options
authorZbigniew Jędrzejewski-Szmek <>2018-06-09 13:41:44 +0200
committerSven Eden <>2018-08-24 16:47:08 +0200
commit1b10c04c333e0c1e5c6e373d55f2564db728ed25 (patch)
treecacb3396ae8fceafb786c3ea990d6ac52c63d69a /src/basic/string-util.c
parente62e8b3d2e9ac7f1e1a13578eb989f751b6c94ae (diff)
basic/ellipsize: do not assume the string is NUL-terminated when length is given
oss-fuzz flags this as: ==1==WARNING: MemorySanitizer: use-of-uninitialized-value 0. 0x7fce77519ca5 in ascii_is_valid systemd/src/basic/utf8.c:252:9 1. 0x7fce774d203c in ellipsize_mem systemd/src/basic/string-util.c:544:13 2. 0x7fce7730a299 in print_multiline systemd/src/shared/logs-show.c:244:37 3. 0x7fce772ffdf3 in output_short systemd/src/shared/logs-show.c:495:25 4. 0x7fce772f5a27 in show_journal_entry systemd/src/shared/logs-show.c:1077:15 5. 0x7fce772f66ad in show_journal systemd/src/shared/logs-show.c:1164:29 6. 0x4a2fa0 in LLVMFuzzerTestOneInput systemd/src/fuzz/fuzz-journal-remote.c:64:21 ... I didn't reproduce the issue, but this looks like an obvious error: the length is specified, so we shouldn't use the string with any functions for normal C-strings.
Diffstat (limited to 'src/basic/string-util.c')
1 files changed, 1 insertions, 1 deletions
diff --git a/src/basic/string-util.c b/src/basic/string-util.c
index 13456f101..1f8bf3d4d 100644
--- a/src/basic/string-util.c
+++ b/src/basic/string-util.c
@@ -545,7 +545,7 @@ char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigne
return strdup("");
/* If no multibyte characters use ascii_ellipsize_mem for speed */
- if (ascii_is_valid(s))
+ if (ascii_is_valid_n(s, old_length))
return ascii_ellipsize_mem(s, old_length, new_length, percent);
x = ((new_length - 1) * percent) / 100;