bnxt_en: Fix RX consumer index logic in the error path.

In the Linux kernel, the following vulnerability has been resolved:

bnxt_en: Fix RX consumer index logic in the error path.

In bnxt_rx_pkt(), the RX buffers are expected to complete in order.

If the RX consumer index indicates an out of order buffer completion,

it means we are hitting a hardware bug and the driver will abort all

remaining RX packets and reset the RX ring. The RX consumer index

that we pass to bnxt_discard_rx() is not correct. We should be

passing the current index (tmp_raw_cons) instead of the old index

(raw_cons). This bug can cause us to be at the wrong index when

trying to abort the next RX packet. It can crash like this:

#0 [ffff9bbcdf5c39a8] machine_kexec at ffffffff9b05e007

#1 [ffff9bbcdf5c3a00] __crash_kexec at ffffffff9b111232

#2 [ffff9bbcdf5c3ad0] panic at ffffffff9b07d61e

#3 [ffff9bbcdf5c3b50] oops_end at ffffffff9b030978

#4 [ffff9bbcdf5c3b78] no_context at ffffffff9b06aaf0

#5 [ffff9bbcdf5c3bd8] __bad_area_nosemaphore at ffffffff9b06ae2e

#6 [ffff9bbcdf5c3c28] bad_area_nosemaphore at ffffffff9b06af24

#7 [ffff9bbcdf5c3c38] __do_page_fault at ffffffff9b06b67e

#8 [ffff9bbcdf5c3cb0] do_page_fault at ffffffff9b06bb12

#9 [ffff9bbcdf5c3ce0] page_fault at ffffffff9bc015c5

[exception RIP: bnxt_rx_pkt+237]

RIP: ffffffffc0259cdd RSP: ffff9bbcdf5c3d98 RFLAGS: 00010213

RAX: 000000005dd8097f RBX: ffff9ba4cb11b7e0 RCX: ffffa923cf6e9000

RDX: 0000000000000fff RSI: 0000000000000627 RDI: 0000000000001000

RBP: ffff9bbcdf5c3e60 R8: 0000000000420003 R9: 000000000000020d

R10: ffffa923cf6ec138 R11: ffff9bbcdf5c3e83 R12: ffff9ba4d6f928c0

R13: ffff9ba4cac28080 R14: ffff9ba4cb11b7f0 R15: ffff9ba4d5a30000

ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018