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-rw-r--r--pcitool/cli.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/pcitool/cli.c b/pcitool/cli.c
index 3f1af74..caa55a9 100644
--- a/pcitool/cli.c
+++ b/pcitool/cli.c
@@ -1291,9 +1291,11 @@ int ReadData(pcilib_t *handle, ACCESS_MODE mode, FLAGS flags, pcilib_dma_engine_
size = 2048; bytes = 0;
do {
- size *= 2;
- buf = realloc(buf, size);
- if (!buf) Error("Allocation of %zu bytes of memory has failed", size);
+ if ((size - bytes) < 4096) {
+ size *= 2;
+ buf = realloc(buf, size);
+ if (!buf) Error("Allocation of %zu bytes of memory has failed", size);
+ }
err = pcilib_read_dma_custom(handle, dmaid, addr, size - bytes, dma_flags, timeout, buf + bytes, &ret);
bytes += ret;