auth-filter: do not write more than we've read

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/cgit.c b/cgit.c
index e2d7891..fda0aa4 100644
--- a/cgit.c
+++ b/cgit.c
@@ -659,13 +659,13 @@ static inline void open_auth_filter(const char *function)
 static inline void authenticate_post(void)
 {
         char buffer[MAX_AUTHENTICATION_POST_BYTES];
-        unsigned int len;
+        ssize_t len;
 
         open_auth_filter("authenticate-post");
         len = ctx.env.content_length;
         if (len > MAX_AUTHENTICATION_POST_BYTES)
                 len = MAX_AUTHENTICATION_POST_BYTES;
-        if (read(STDIN_FILENO, buffer, len) < 0)
+        if ((len = read(STDIN_FILENO, buffer, len)) < 0)
                 die_errno("Could not read POST from stdin");
         if (write(STDOUT_FILENO, buffer, len) < 0)
                 die_errno("Could not write POST to stdout");