Commit 466e8bf1 authored by Michal Schmidt's avatar Michal Schmidt Committed by David S. Miller

bnx2x: prevent crash when accessing PTP with interface down

It is possible to crash the kernel by accessing a PTP device while its
associated bnx2x interface is down. Before the interface is brought up,
the timecounter is not initialized, so accessing it results in NULL
dereference.

Fix it by checking if the interface is up.

Use -ENETDOWN as the error code when the interface is down.
 -EFAULT in bnx2x_ptp_adjfreq() did not seem right.

Tested using phc_ctl get/set/adj/freq commands.
Signed-off-by: default avatarMichal Schmidt <mschmidt@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 239870f2
...@@ -13738,7 +13738,7 @@ static int bnx2x_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb) ...@@ -13738,7 +13738,7 @@ static int bnx2x_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
if (!netif_running(bp->dev)) { if (!netif_running(bp->dev)) {
DP(BNX2X_MSG_PTP, DP(BNX2X_MSG_PTP,
"PTP adjfreq called while the interface is down\n"); "PTP adjfreq called while the interface is down\n");
return -EFAULT; return -ENETDOWN;
} }
if (ppb < 0) { if (ppb < 0) {
...@@ -13797,6 +13797,12 @@ static int bnx2x_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) ...@@ -13797,6 +13797,12 @@ static int bnx2x_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
{ {
struct bnx2x *bp = container_of(ptp, struct bnx2x, ptp_clock_info); struct bnx2x *bp = container_of(ptp, struct bnx2x, ptp_clock_info);
if (!netif_running(bp->dev)) {
DP(BNX2X_MSG_PTP,
"PTP adjtime called while the interface is down\n");
return -ENETDOWN;
}
DP(BNX2X_MSG_PTP, "PTP adjtime called, delta = %llx\n", delta); DP(BNX2X_MSG_PTP, "PTP adjtime called, delta = %llx\n", delta);
timecounter_adjtime(&bp->timecounter, delta); timecounter_adjtime(&bp->timecounter, delta);
...@@ -13809,6 +13815,12 @@ static int bnx2x_ptp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts) ...@@ -13809,6 +13815,12 @@ static int bnx2x_ptp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
struct bnx2x *bp = container_of(ptp, struct bnx2x, ptp_clock_info); struct bnx2x *bp = container_of(ptp, struct bnx2x, ptp_clock_info);
u64 ns; u64 ns;
if (!netif_running(bp->dev)) {
DP(BNX2X_MSG_PTP,
"PTP gettime called while the interface is down\n");
return -ENETDOWN;
}
ns = timecounter_read(&bp->timecounter); ns = timecounter_read(&bp->timecounter);
DP(BNX2X_MSG_PTP, "PTP gettime called, ns = %llu\n", ns); DP(BNX2X_MSG_PTP, "PTP gettime called, ns = %llu\n", ns);
...@@ -13824,6 +13836,12 @@ static int bnx2x_ptp_settime(struct ptp_clock_info *ptp, ...@@ -13824,6 +13836,12 @@ static int bnx2x_ptp_settime(struct ptp_clock_info *ptp,
struct bnx2x *bp = container_of(ptp, struct bnx2x, ptp_clock_info); struct bnx2x *bp = container_of(ptp, struct bnx2x, ptp_clock_info);
u64 ns; u64 ns;
if (!netif_running(bp->dev)) {
DP(BNX2X_MSG_PTP,
"PTP settime called while the interface is down\n");
return -ENETDOWN;
}
ns = timespec64_to_ns(ts); ns = timespec64_to_ns(ts);
DP(BNX2X_MSG_PTP, "PTP settime called, ns = %llu\n", ns); DP(BNX2X_MSG_PTP, "PTP settime called, ns = %llu\n", ns);
......
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