apk: sanitize return value

Most applets return whatever apk_solver_commit() returns. It is the
number of errors found (or negative for hard error). Sanitize the
error value to not give false success exit code in the unlikely case
of errors % 256 == 0.

Reported-by: Max Justicz <max@justi.cz>
(cherry picked from commit 7b654e125461b00bc26e52b25e6a7be3a32c11b9)

1 files changed, 3 insertions, 0 deletions

diff --git a/src/apk.c b/src/apk.c
index 5206ead..c2ee015 100644
--- a/src/apk.c
+++ b/src/apk.c
@@ -612,5 +612,8 @@ err:
 		free(ctx);
 
 	fetchConnectionCacheClose();
+
+	if (r < 0) r = 250;
+	if (r > 99) r = 99;
 	return r;
 }