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102 lines
3.5 KiB
Diff
102 lines
3.5 KiB
Diff
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Wed, 4 Jan 2017 12:09:41 +0100
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Subject: [PATCH] brcmfmac: avoid writing channel out of allocated array
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Our code was assigning number of channels to the index variable by
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default. If firmware reported channel we didn't predict this would
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result in using that initial index value and writing out of array. This
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never happened so far (we got a complete list of supported channels) but
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it means possible memory corruption so we should handle it anyway.
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This patch simply detects unexpected channel and ignores it.
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As we don't try to create new entry now, it's also safe to drop hw_value
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and center_freq assignment. For known channels we have these set anyway.
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I decided to fix this issue by assigning NULL or a target channel to the
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channel variable. This was one of possible ways, I prefefred this one as
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it also avoids using channel[index] over and over.
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Fixes: 58de92d2f95e ("brcmfmac: use static superset of channels for wiphy bands")
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
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Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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---
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--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
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+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
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@@ -5915,7 +5915,6 @@ static int brcmf_construct_chaninfo(stru
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u32 i, j;
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u32 total;
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u32 chaninfo;
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- u32 index;
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pbuf = kzalloc(BRCMF_DCMD_MEDLEN, GFP_KERNEL);
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@@ -5963,33 +5962,36 @@ static int brcmf_construct_chaninfo(stru
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ch.bw == BRCMU_CHAN_BW_80)
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continue;
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- channel = band->channels;
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- index = band->n_channels;
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+ channel = NULL;
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for (j = 0; j < band->n_channels; j++) {
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- if (channel[j].hw_value == ch.control_ch_num) {
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- index = j;
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+ if (band->channels[j].hw_value == ch.control_ch_num) {
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+ channel = &band->channels[j];
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break;
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}
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}
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- channel[index].center_freq =
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- ieee80211_channel_to_frequency(ch.control_ch_num,
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- band->band);
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- channel[index].hw_value = ch.control_ch_num;
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+ if (!channel) {
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+ /* It seems firmware supports some channel we never
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+ * considered. Something new in IEEE standard?
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+ */
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+ brcmf_err("Ignoring unexpected firmware channel %d\n",
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+ ch.control_ch_num);
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+ continue;
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+ }
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/* assuming the chanspecs order is HT20,
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* HT40 upper, HT40 lower, and VHT80.
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*/
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if (ch.bw == BRCMU_CHAN_BW_80) {
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- channel[index].flags &= ~IEEE80211_CHAN_NO_80MHZ;
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+ channel->flags &= ~IEEE80211_CHAN_NO_80MHZ;
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} else if (ch.bw == BRCMU_CHAN_BW_40) {
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- brcmf_update_bw40_channel_flag(&channel[index], &ch);
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+ brcmf_update_bw40_channel_flag(channel, &ch);
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} else {
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/* enable the channel and disable other bandwidths
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* for now as mentioned order assure they are enabled
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* for subsequent chanspecs.
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*/
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- channel[index].flags = IEEE80211_CHAN_NO_HT40 |
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- IEEE80211_CHAN_NO_80MHZ;
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+ channel->flags = IEEE80211_CHAN_NO_HT40 |
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+ IEEE80211_CHAN_NO_80MHZ;
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ch.bw = BRCMU_CHAN_BW_20;
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cfg->d11inf.encchspec(&ch);
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chaninfo = ch.chspec;
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@@ -5997,11 +5999,11 @@ static int brcmf_construct_chaninfo(stru
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&chaninfo);
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if (!err) {
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if (chaninfo & WL_CHAN_RADAR)
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- channel[index].flags |=
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+ channel->flags |=
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(IEEE80211_CHAN_RADAR |
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IEEE80211_CHAN_NO_IR);
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if (chaninfo & WL_CHAN_PASSIVE)
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- channel[index].flags |=
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+ channel->flags |=
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IEEE80211_CHAN_NO_IR;
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}
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}
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