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brcmfmac: return error when getting invalid max_flowrings from dongle

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When firmware hit trap at initialization, host will read abnormal
max_flowrings number from dongle, and it will cause kernel panic when
doing iowrite to initialize dongle ring.
To detect this error at early stage, we directly return error when getting
invalid max_flowrings(>256).

Signed-off-by: Wright Feng <wright.feng@cypress.com>
Signed-off-by: Chi-hsien Lin <chi-hsien.lin@cypress.com>
Signed-off-by: Ian Lin <ian.lin@infineon.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220929031001.9962-3-ian.lin@infineon.com
This commit is contained in:
Wright Feng 2022-09-28 22:10:00 -05:00 committed by Kalle Valo
parent dcb485dfc8
commit 2aca4f3734
1 changed files with 4 additions and 0 deletions
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4
drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
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@ -1228,6 +1228,10 @@ static int brcmf_pcie_init_ringbuffers(struct brcmf_pciedev_info *devinfo)
BRCMF_NROF_H2D_COMMON_MSGRINGS;
max_completionrings = BRCMF_NROF_D2H_COMMON_MSGRINGS;
}
if (max_flowrings > 256) {
brcmf_err(bus, "invalid max_flowrings(%d)\n", max_flowrings);
return -EIO;
}
if (devinfo->dma_idx_sz != 0) {
bufsz = (max_submissionrings + max_completionrings) *