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50 lines
1.4 KiB
Diff
50 lines
1.4 KiB
Diff
Fix error handling for read from stdin in attach.c
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attach.c did not correctly handle a read from stdin when read returned
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an error. The code assigned the return value of read to pkt.len (an
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unsigned char) before checking the value. This prevented the error check
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from working correctly, since an unsigned integer can never be < 0.
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A packet with an invalid length was then sent to the master, which then
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sent 255 bytes of garbage to the program.
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Fix the bug in attach.c and the unchecked packet length bug in master.c.
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Report and initial patch by Enrico Scholz.
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--- a/master.c 2012/07/01 21:26:10 1.14
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+++ b/master.c 2012/07/01 21:44:34 1.15
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@@ -351,7 +351,10 @@
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/* Push out data to the program. */
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if (pkt.type == MSG_PUSH)
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- write(the_pty.fd, pkt.u.buf, pkt.len);
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+ {
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+ if (pkt.len <= sizeof(pkt.u.buf))
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+ write(the_pty.fd, pkt.u.buf, pkt.len);
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+ }
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/* Attach or detach from the program. */
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else if (pkt.type == MSG_ATTACH)
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--- a/attach.c 2012/07/01 21:26:10 1.12
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+++ b/attach.c 2012/07/01 21:44:34 1.13
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@@ -237,12 +237,16 @@
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/* stdin activity */
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if (n > 0 && FD_ISSET(0, &readfds))
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{
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+ ssize_t len;
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+
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pkt.type = MSG_PUSH;
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memset(pkt.u.buf, 0, sizeof(pkt.u.buf));
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- pkt.len = read(0, pkt.u.buf, sizeof(pkt.u.buf));
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+ len = read(0, pkt.u.buf, sizeof(pkt.u.buf));
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- if (pkt.len <= 0)
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+ if (len <= 0)
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exit(1);
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+
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+ pkt.len = len;
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process_kbd(s, &pkt);
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n--;
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}
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