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diff --git a/mspack/cabd.c b/mspack/cabd.c
index 16021ee..8b10934 100644
--- a/mspack/cabd.c
+++ b/mspack/cabd.c
@@ -521,10 +521,13 @@ static char *cabd_read_string(struct mspack_system *sys,
{
off_t base = sys->tell(fh);
char buf[256], *str;
- unsigned int len, i, ok;
+ int len, i, ok;
/* read up to 256 bytes */
- len = sys->read(fh, &buf[0], 256);
+ if ((len = sys->read(fh, &buf[0], 256)) <= 0) {
+ *error = MSPACK_ERR_READ;
+ return NULL;
+ }
/* search for a null terminator in the buffer */
for (i = 0, ok = 0; i < len; i++) if (!buf[i]) { ok = 1; break; }
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