fips: Check return value from ftell

* src/fips.c (get_file_offset): Check return value of ftell to be able
  to detect errors.
--

Originally reported by coverity.

Signed-off-by: Jakub Jelen <jjelen@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/fips.c b/src/fips.c
index 272aabae..0d89b6da 100644
--- a/src/fips.c
+++ b/src/fips.c
@@ -681,6 +681,8 @@ get_file_offset (FILE *fp, ElfW (Ehdr) *ehdr_p,
         return gpg_error_from_syserror ();
 
       off = ftell (fp);
+      if (off < 0)
+        return gpg_error_from_syserror ();
       if (shdr.sh_type == SHT_NOTE && shdr.sh_flags == 0 && shdr.sh_size == 48)
         {
           const char header_of_the_note[] = {