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-rw-r--r--docs/libcurl/opts/CURLOPT_BUFFERSIZE.33
-rw-r--r--lib/url.c9
2 files changed, 11 insertions, 1 deletions
diff --git a/docs/libcurl/opts/CURLOPT_BUFFERSIZE.3 b/docs/libcurl/opts/CURLOPT_BUFFERSIZE.3
index 5d9b065af..b4100e607 100644
--- a/docs/libcurl/opts/CURLOPT_BUFFERSIZE.3
+++ b/docs/libcurl/opts/CURLOPT_BUFFERSIZE.3
@@ -37,7 +37,8 @@ This is just treated as a request, not an order. You cannot be guaranteed to
actually get the given size.
This buffer size is by default \fICURL_MAX_WRITE_SIZE\fP (16kB). The maximum
-buffer size allowed to set is \fICURL_MAX_READ_SIZE\fP (512kB).
+buffer size allowed to be set is \fICURL_MAX_READ_SIZE\fP (512kB). The minimum
+buffer size allowed to be set is 1024.
.SH DEFAULT
CURL_MAX_WRITE_SIZE (16kB)
.SH PROTOCOLS
diff --git a/lib/url.c b/lib/url.c
index 073c4331b..8e470b0e1 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -144,6 +144,15 @@ static unsigned int get_protocol_family(unsigned int protocol);
#define READBUFFER_MAX CURL_MAX_READ_SIZE
#define READBUFFER_MIN 1024
+/* Some parts of the code (e.g. chunked encoding) assume this buffer has at
+ * more than just a few bytes to play with. Don't let it become too small or
+ * bad things will happen.
+ */
+#if READBUFFER_SIZE < READBUFFER_MIN
+# error READBUFFER_SIZE is too small
+#endif
+
+
/*
* Protocol table.
*/