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media: ti-vpe: cal: Fix a NULL pointer dereference in cal_ctx_v4l2_init_formats() 

In cal_ctx_v4l2_init_formats(), devm_kzalloc() is assigned to
ctx->active_fmt and there is a dereference of it after that, which could
lead to NULL pointer dereference on failure of devm_kzalloc().

Fix this bug by adding a NULL check of ctx->active_fmt.

This bug was found by a static analyzer.

Builds with 'make allyesconfig' show no new warnings, and our static
analyzer no longer warns about this code.

Fixes: 7168155002 ("media: ti-vpe: cal: Move format handling to cal.c and expose helpers")
Signed-off-by: Zhou Qingyang <zhou1615@umn.edu>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Zhou Qingyang 2022-01-24 18:20:01 +01:00 committed by Mauro Carvalho Chehab
parent cc74074ad9
commit abd7788985
1 changed files with 3 additions and 0 deletions
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3
drivers/media/platform/ti-vpe/cal-video.c
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@ -823,6 +823,9 @@ static int cal_ctx_v4l2_init_formats(struct cal_ctx *ctx)
/* Enumerate sub device formats and enable all matching local formats */
ctx->active_fmt = devm_kcalloc(ctx->cal->dev, cal_num_formats,
sizeof(*ctx->active_fmt), GFP_KERNEL);
if (!ctx->active_fmt)
return -ENOMEM;
ctx->num_active_fmt = 0;
for (j = 0, i = 0; ; ++j) {