libgrapheme

Freestanding C library for unicode string handling
git clone https://git.sinitax.com/suckless/libgrapheme
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commit 558b9cc3bc6961d26104cf726fe148f58ba36940
parent 5a3f01e8a1b9a7847dad17260dd859d5c92bb6bd
Author: Laslo Hunhold <dev@frign.de>
Date:   Sun, 13 Nov 2022 09:12:25 +0100

Prevent two theoretical null-pointer-dereferences in gen/util.c

This was found using static analysis and is not a security issue given
this is in the generating code, so no runtime-affection. The worst that
could've happened beforehand is that the generating code segfaults and
produces garbage tables which would lead to compilation failure.

Signed-off-by: Laslo Hunhold <dev@frign.de>

Diffstat:
Mgen/util.c | 7++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/gen/util.c b/gen/util.c @@ -602,7 +602,7 @@ properties_generate_break_property(const struct property_spec *spec, static int break_test_callback(const char *fname, char **field, size_t nfields, - char *comment, void *payload) + char *comment, void *payload) { struct break_test *t, **test = ((struct break_test_payload *)payload)->test; @@ -668,7 +668,7 @@ break_test_callback(const char *fname, char **field, size_t nfields, } } } - if (t->len[t->lenlen - 1] == 0) { + if (t->lenlen > 0 && t->len[t->lenlen - 1] == 0) { /* * we allocated one more length than we needed because * the breakpoint was at the end @@ -677,7 +677,8 @@ break_test_callback(const char *fname, char **field, size_t nfields, } /* store comment */ - if (((*test)[*testlen - 1].descr = strdup(comment)) == NULL) { + if (comment != NULL && + ((*test)[*testlen - 1].descr = strdup(comment)) == NULL) { fprintf(stderr, "break_test_callback: strdup: %s.\n", strerror(errno)); return 1;