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| author | Stefan Roese <sr@denx.de> | 2017-04-27 14:21:41 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2017-05-01 15:51:06 +0530 |
| commit | fbfb8e1dcea0508f203535a92faea7a3ddf24558 (patch) | |
| tree | bdeb3cc033b92a8abdd8b3c135780b3d0e055252 | |
| parent | 58532e66261e8cee52ac0abbe33c502b6e76f380 (diff) | |
| download | linux-fbfb8e1dcea0508f203535a92faea7a3ddf24558.tar.bz2 | |
dmaengine: dmatest: Add check for supported buffer count (sg_buffers)
When using dmatest with sg_buffers=128 I stumbled upon the problem, that
the "map_cnt" variable of "struct dmaengine_unmap_data" was set to 0.
"map_cnt" is an "u8" variable, resulting in an overrun when its
value is set to src_cnt + dst_cnt, to twice the sg_buffer value.
This patch adds a small check to dmatest, so that this confusing error
is detected and the test is aborted.
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Kedareswara rao Appana <appanad@xilinx.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
| -rw-r--r-- | drivers/dma/dmatest.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c index d042b2b4965e..a07ef3d6b3ec 100644 --- a/drivers/dma/dmatest.c +++ b/drivers/dma/dmatest.c @@ -535,6 +535,13 @@ static int dmatest_func(void *data) total_tests++; + /* Check if buffer count fits into map count variable (u8) */ + if ((src_cnt + dst_cnt) >= 255) { + pr_err("too many buffers (%d of 255 supported)\n", + src_cnt + dst_cnt); + break; + } + if (1 << align > params->buf_size) { pr_err("%u-byte buffer too small for %d-byte alignment\n", params->buf_size, 1 << align); |