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-rw-r--r--posix/regexec.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/posix/regexec.c b/posix/regexec.c
index 949c170..f877016 100644
--- a/posix/regexec.c
+++ b/posix/regexec.c
@@ -4104,6 +4104,10 @@ extend_buffers (re_match_context_t *mctx)
reg_errcode_t ret;
re_string_t *pstr = &mctx->input;
+ /* Avoid overflow. */
+ if (BE (INT_MAX / 2 / sizeof (re_dfastate_t *) <= pstr->bufs_len, 0))
+ return REG_ESPACE;
+
/* Double the lengthes of the buffers. */
ret = re_string_realloc_buffers (pstr, pstr->bufs_len * 2);
if (BE (ret != REG_NOERROR, 0))