foo*sum: report I/O errors, don't merely exit with 1.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/coreutils/md5_sha1_sum.c b/coreutils/md5_sha1_sum.c
index 92a4d4462..b23c6c0ff 100644
--- a/coreutils/md5_sha1_sum.c
+++ b/coreutils/md5_sha1_sum.c
@@ -151,7 +151,9 @@ static uint8_t *hash_file(const char *filename)
                         update(&context, in_buf, count);
                 }
                 hash_value = NULL;
-                if (count == 0) {
+                if (count < 0) {
+                        bb_perror_msg("can't read '%s'", filename);
+                else /* count == 0 */ {
                         final(&context, in_buf);
                         hash_value = hash_bin_to_hex(in_buf, hash_len);
                 }