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gpu: nvgpu: make entries check robust for kernel submit

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Check on the number of entries for kernel mode submit needs to be more
robust to avoid overflows. The overflow can make check useless.

Bug 5045127
Bug 5079301

Signed-off-by: Shashank Singh <shashsingh@nvidia.com>
Change-Id: I2247718097bad922ac38dd7574b0fc008b1e02e4
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/3283910
(cherry picked from commit 6ed9cc57b4ca77424da58c9a90d7a19ed6deb11c)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/3295258
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
This commit is contained in:
Shashank Singh
2025-01-15 08:30:52 +00:00
committed by mobile promotions
parent 2eabcdb8a4
commit af45c11d05
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/nvgpu/common/fifo/submit.c
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@@ -810,7 +810,8 @@ static int nvgpu_submit_channel_gpfifo(struct nvgpu_channel *c,
* So, add extra entries in user request. Also, HW with fifo size N * So, add extra entries in user request. Also, HW with fifo size N
* can accept only N-1 entries. * can accept only N-1 entries.
*/ */
if (c->gpfifo.entry_num - 1U < num_entries + EXTRA_GPFIFO_ENTRIES) { if ((c->gpfifo.entry_num < (EXTRA_GPFIFO_ENTRIES + 1U)) ||
((c->gpfifo.entry_num - EXTRA_GPFIFO_ENTRIES - 1U) < num_entries)) {
nvgpu_err(g, "not enough gpfifo space allocated"); nvgpu_err(g, "not enough gpfifo space allocated");
return -ENOMEM; return -ENOMEM;
} }