diff --git a/pack-write.c b/pack-write.c
index a333ec675476b4f10a5e12fe3303333ea200faea..fea62841920c9647edfcfba249a59bfb91170d8e 100644
--- a/pack-write.c
+++ b/pack-write.c
@@ -213,14 +213,19 @@ void fixup_pack_header_footer(int pack_fd,
 	git_SHA_CTX old_sha1_ctx, new_sha1_ctx;
 	struct pack_header hdr;
 	char *buf;
+	ssize_t read_result;
 
 	git_SHA1_Init(&old_sha1_ctx);
 	git_SHA1_Init(&new_sha1_ctx);
 
 	if (lseek(pack_fd, 0, SEEK_SET) != 0)
 		die_errno("Failed seeking to start of '%s'", pack_name);
-	if (read_in_full(pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
+	read_result = read_in_full(pack_fd, &hdr, sizeof(hdr));
+	if (read_result < 0)
 		die_errno("Unable to reread header of '%s'", pack_name);
+	else if (read_result != sizeof(hdr))
+		die_errno("Unexpected short read for header of '%s'",
+			  pack_name);
 	if (lseek(pack_fd, 0, SEEK_SET) != 0)
 		die_errno("Failed seeking to start of '%s'", pack_name);
 	git_SHA1_Update(&old_sha1_ctx, &hdr, sizeof(hdr));
diff --git a/sha1_file.c b/sha1_file.c
index dd7cbe52ef73754f30dfc61379549bc2fbd5e86c..11346cf6d83e69cfb39ab059de8cae6f6c982c64 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1757,10 +1757,15 @@ static int index_core(unsigned char *sha1, int fd, size_t size,
 		ret = index_mem(sha1, "", size, type, path, flags);
 	} else if (size <= SMALL_FILE_SIZE) {
 		char *buf = xmalloc(size);
-		if (size == read_in_full(fd, buf, size))
-			ret = index_mem(sha1, buf, size, type, path, flags);
+		ssize_t read_result = read_in_full(fd, buf, size);
+		if (read_result < 0)
+			ret = error_errno("read error while indexing %s",
+					  path ? path : "<unknown>");
+		else if (read_result != size)
+			ret = error("short read while indexing %s",
+				    path ? path : "<unknown>");
 		else
-			ret = error_errno("short read");
+			ret = index_mem(sha1, buf, size, type, path, flags);
 		free(buf);
 	} else {
 		void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);