diff options
author | Alex Elder <elder@linaro.org> | 2023-03-28 11:27:51 -0500 |
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committer | Jakub Kicinski <kuba@kernel.org> | 2023-03-29 21:27:40 -0700 |
commit | 6c75dc94f2b27fff57b305af9236eea181a00b6c (patch) | |
tree | 918bcbe45126d252383daf7c7b755ba3c29946ab /drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | |
parent | 5f70bcbca469a087b54ad2d934185ed69a098576 (diff) |
net: ipa: compute DMA pool size properly
In gsi_trans_pool_init_dma(), the total size of a pool of memory
used for DMA transactions is calculated. However the calculation is
done incorrectly.
For 4KB pages, this total size is currently always more than one
page, and as a result, the calculation produces a positive (though
incorrect) total size. The code still works in this case; we just
end up with fewer DMA pool entries than we intended.
Bjorn Andersson tested booting a kernel with 16KB pages, and hit a
null pointer derereference in sg_alloc_append_table_from_pages(),
descending from gsi_trans_pool_init_dma(). The cause of this was
that a 16KB total size was going to be allocated, and with 16KB
pages the order of that allocation is 0. The total_size calculation
yielded 0, which eventually led to the crash.
Correcting the total_size calculation fixes the problem.
Reported-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Tested-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Fixes: 9dd441e4ed57 ("soc: qcom: ipa: GSI transactions")
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/20230328162751.2861791-1-elder@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c')
0 files changed, 0 insertions, 0 deletions