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From 646160e2175f9e0ba33e4f2bda12d84555e9c30e Mon Sep 17 00:00:00 2001
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From: Alexander Amelkin <alexander@amelkin.msk.ru>
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Date: Thu, 29 Nov 2018 13:10:53 +0300
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Subject: [PATCH] lanplus: Cleanup. Refix 6dec83ff, fix be2c0c4b
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This is a cleanup commit.
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Commit 6dec83ff removed assignment of `rsp` pointer
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in SOL-processing block of ipmi_lan_poll_single(),
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but left the check for the pointer validity in place.
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Although that has effectively fixed the bug of potentially
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accessing the null `rsp` pointer in the `else` block introduced
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with be2c0c4b, the resulting if/else looked suspicious and left
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and impression that a NULL pointer could still be accessed.
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This commit removes the check for `rsp` from the `if`
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as it is checked at the start of the function where `rsp`
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is initialized (and that is the only place where it is ever changed).
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Signed-off-by: Alexander Amelkin <alexander@amelkin.msk.ru>
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(cherry picked from commit 64727f59c4a1412fdb73e092fb838ae66e2aad1a)
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lanplus: Fix segfault for truncated dcmi response
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On occasion a dcmi power reading will return error C6, and a
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truncated response payload. As the decrypted payload is shorter
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than the expected length, lanplus_decrypt_aes_cbc_128() adjusts
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the payload_size downward by one byte. In ipmi_lan_poll_single()
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the calculation to determine if the payload size has increased
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erroniously sets extra_data_length to -1, with a subsequent
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segv when calling a memmove to shift response data.
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The fix is to check for a positive value in the extra_data_length.
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Resolves ipmitool/ipmitool#72
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(cherry picked from commit 9ec2232321a7bca7e1fb8f939d071f12c8dfa7fd)
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---
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src/plugins/lanplus/lanplus.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/src/plugins/lanplus/lanplus.c b/src/plugins/lanplus/lanplus.c
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index c442c0e..ef132f6 100644
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--- a/src/plugins/lanplus/lanplus.c
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+++ b/src/plugins/lanplus/lanplus.c
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@@ -814,7 +814,7 @@ ipmi_lan_poll_single(struct ipmi_intf * intf)
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* rsp->data_len becomes the length of that data
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*/
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extra_data_length = payload_size - (offset - payload_start) - 1;
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- if (extra_data_length) {
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+ if (extra_data_length > 0) {
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rsp->data_len = extra_data_length;
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memmove(rsp->data, rsp->data + offset, extra_data_length);
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} else {
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@@ -868,7 +868,7 @@ ipmi_lan_poll_single(struct ipmi_intf * intf)
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}
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read_sol_packet(rsp, &offset);
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extra_data_length = payload_size - (offset - payload_start);
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- if (rsp && extra_data_length) {
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+ if (extra_data_length > 0) {
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rsp->data_len = extra_data_length;
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memmove(rsp->data, rsp->data + offset, extra_data_length);
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} else {
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--
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2.26.3
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