optionsfrom: Properly handle errors when determining file size

diff --git a/src/libstrongswan/utils/optionsfrom.c b/src/libstrongswan/utils/optionsfrom.c
index 117071351cdb8f87a1a18a8e66aea0539e4eeb98..6f721c9efcd02c5b1d630df34dd1cb3b529f6b3b 100644 (file)
--- a/src/libstrongswan/utils/optionsfrom.c
+++ b/src/libstrongswan/utils/optionsfrom.c
@@ -90,8 +90,13 @@ METHOD(options_t, from, bool,
        }
 
        /* determine the file size */
-       fseek(fd, 0, SEEK_END);
-       src.len = ftell(fd);
+       if (fseek(fd, 0, SEEK_END) == -1 || (src.len = ftell(fd)) == -1)
+       {
+               DBG1(DBG_LIB, "optionsfrom: unable to determine size of '%s': %s",
+                        filename, strerror(errno));
+               fclose(fd);
+               return FALSE;
+       }
        rewind(fd);
 
        /* allocate one byte more just in case of a missing final newline */