tools/cws2fws: Check read() for failure

Fixes: CID1452579 Argument cannot be negative

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 0b3cdd7cc2c63969e144cc3eb39d0c61260509ee)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

1 files changed, 6 insertions, 0 deletions

diff --git a/tools/cws2fws.c b/tools/cws2fws.c
index 7046b69957..9ce321fe20 100644
--- a/tools/cws2fws.c
+++ b/tools/cws2fws.c
@@ -89,6 +89,12 @@ int main(int argc, char *argv[])
     for (i = 0; i < comp_len - 8;) {
         int ret, len = read(fd_in, &buf_in, 1024);
 
+        if (len == -1) {
+            printf("read failure\n");
+            inflateEnd(&zstream);
+            goto out;
+        }
+
         dbgprintf("read %d bytes\n", len);
 
         last_out = zstream.total_out;