From: Michael Tremer <michael.tremer@ipfire.org>
Date: Sat, 12 Oct 2024 14:10:40 +0000 (+0000)
Subject: pty: Don't try to map empty output buffers
X-Git-Tag: 0.9.30~1080
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=92f6cd3678427aecb5661456647fde60b5ce2025;p=pakfire.git

pty: Don't try to map empty output buffers

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/src/libpakfire/pty.c b/src/libpakfire/pty.c
index 21961a47e..8d8607b10 100644
--- a/src/libpakfire/pty.c
+++ b/src/libpakfire/pty.c
@@ -122,6 +122,10 @@ static int pakfire_pty_store_output(struct pakfire_pty* pty) {
 
 	CTX_DEBUG(pty->ctx, "Read %jd byte(s) of output\n", buffer.st_size);
 
+	// Don't try to map an empty buffer
+	if (!buffer.st_size)
+		return 0;
+
 	// Map the output into memory
 	pty->output.iov_base = mmap(NULL, buffer.st_size, PROT_READ, MAP_SHARED, pty->stdout.fd, 0);
 	if (pty->output.iov_base == MAP_FAILED) {