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tools: mkenvimage: Fix possible segfault on stdin input

The size of 'filebuf' was not increased as more and more bytes are read
from stdin, but 'filebuf' was always reallocated to the same fix size.
This works as long as only less bytes than the initial buffer size come
in, for more input this will segfault. (It actually does, I tested
that.) So for each loop cycle the buffer size has to be increased by the
number of bytes we want to read.

Signed-off-by: Alexander Dahl <ada@thorsis.com>
Alexander Dahl 6 年之前
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c3b115f4b7
共有 1 個文件被更改,包括 1 次插入1 次删除
  1. 1 1
      tools/mkenvimage.c

+ 1 - 1
tools/mkenvimage.c

@@ -162,7 +162,7 @@ int main(int argc, char **argv)
 		txt_fd = STDIN_FILENO;
 
 		do {
-			filebuf = realloc(filebuf, readlen);
+			filebuf = realloc(filebuf, filesize + readlen);
 			if (!filebuf) {
 				fprintf(stderr, "Can't realloc memory for the input file buffer\n");
 				return EXIT_FAILURE;