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readline: avoid memcpy() of overlapping regions 

memcpy() for overlapping regions is undefined behavior; use memmove()
instead in readline_hist_add().

[Keep tab characters since surrounding code still uses them -- Stefan]

Signed-off-by: Nickolai Zeldovich <nickolai@csail.mit.edu>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Nickolai Zeldovich 2013-01-07 15:38:39 -05:00 committed by Stefan Hajnoczi
parent 8e4a424b30
commit 7682e85807
1 changed files with 2 additions and 2 deletions
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4
readline.c
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@ -248,8 +248,8 @@ static void readline_hist_add(ReadLineState *rs, const char *cmdline)
if (idx == READLINE_MAX_CMDS) {
/* Need to get one free slot */
free(rs->history[0]);
memcpy(rs->history, &rs->history[1],
(READLINE_MAX_CMDS - 1) * sizeof(char *));
memmove(rs->history, &rs->history[1],
(READLINE_MAX_CMDS - 1) * sizeof(char *));
rs->history[READLINE_MAX_CMDS - 1] = NULL;
idx = READLINE_MAX_CMDS - 1;
}