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fix division by zero crash in "df" output when server
returns zero total filesystem blocks/inodes. Spotted by Guido Vranken; ok
dtucker@

Upstream-ID: 6fb6c2ae6b289aa07b6232dbc0be54682ef5419f
This commit is contained in:
djm@openbsd.org 2017-02-15 01:46:47 +00:00 committed by Damien Miller
parent bd5d7d2395
commit 6d5a41b38b
1 changed files with 24 additions and 16 deletions
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40
sftp.c
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@ -1,4 +1,4 @@
/* $OpenBSD: sftp.c,v 1.177 2016/10/18 12:41:22 millert Exp $ */
/* $OpenBSD: sftp.c,v 1.178 2017/02/15 01:46:47 djm Exp $ */
/*
* Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
*
@ -969,23 +969,34 @@ static int
do_df(struct sftp_conn *conn, const char *path, int hflag, int iflag)
{
struct sftp_statvfs st;
char s_used[FMT_SCALED_STRSIZE];
char s_avail[FMT_SCALED_STRSIZE];
char s_root[FMT_SCALED_STRSIZE];
char s_total[FMT_SCALED_STRSIZE];
unsigned long long ffree;
char s_used[FMT_SCALED_STRSIZE], s_avail[FMT_SCALED_STRSIZE];
char s_root[FMT_SCALED_STRSIZE], s_total[FMT_SCALED_STRSIZE];
char s_icapacity[16], s_dcapacity[16];
if (do_statvfs(conn, path, &st, 1) == -1)
return -1;
if (st.f_files == 0)
strlcpy(s_icapacity, "ERR", sizeof(s_icapacity));
else {
snprintf(s_icapacity, sizeof(s_icapacity), "%3llu%%",
(unsigned long long)(100 * (st.f_files - st.f_ffree) /
st.f_files));
}
if (st.f_blocks == 0)
strlcpy(s_dcapacity, "ERR", sizeof(s_dcapacity));
else {
snprintf(s_dcapacity, sizeof(s_dcapacity), "%3llu%%",
(unsigned long long)(100 * (st.f_blocks - st.f_bfree) /
st.f_blocks));
}
if (iflag) {
ffree = st.f_files ? (100 * (st.f_files - st.f_ffree) / st.f_files) : 0;
printf(" Inodes Used Avail "
"(root) %%Capacity\n");
printf("%11llu %11llu %11llu %11llu %3llu%%\n",
printf("%11llu %11llu %11llu %11llu %s\n",
(unsigned long long)st.f_files,
(unsigned long long)(st.f_files - st.f_ffree),
(unsigned long long)st.f_favail,
(unsigned long long)st.f_ffree, ffree);
(unsigned long long)st.f_ffree, s_icapacity);
} else if (hflag) {
strlcpy(s_used, "error", sizeof(s_used));
strlcpy(s_avail, "error", sizeof(s_avail));
@ -996,21 +1007,18 @@ do_df(struct sftp_conn *conn, const char *path, int hflag, int iflag)
fmt_scaled(st.f_bfree * st.f_frsize, s_root);
fmt_scaled(st.f_blocks * st.f_frsize, s_total);
printf(" Size Used Avail (root) %%Capacity\n");
printf("%7sB %7sB %7sB %7sB %3llu%%\n",
s_total, s_used, s_avail, s_root,
(unsigned long long)(100 * (st.f_blocks - st.f_bfree) /
st.f_blocks));
printf("%7sB %7sB %7sB %7sB %s\n",
s_total, s_used, s_avail, s_root, s_dcapacity);
} else {
printf(" Size Used Avail "
"(root) %%Capacity\n");
printf("%12llu %12llu %12llu %12llu %3llu%%\n",
printf("%12llu %12llu %12llu %12llu %s\n",
(unsigned long long)(st.f_frsize * st.f_blocks / 1024),
(unsigned long long)(st.f_frsize *
(st.f_blocks - st.f_bfree) / 1024),
(unsigned long long)(st.f_frsize * st.f_bavail / 1024),
(unsigned long long)(st.f_frsize * st.f_bfree / 1024),
(unsigned long long)(100 * (st.f_blocks - st.f_bfree) /
st.f_blocks));
s_dcapacity);
}
return 0;
}