i2c: atr: fix dangling adapter pointer on add failure

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i2c_atr_add_adapter() stores atr->adapter[chan_id] before
i2c_add_adapter() so that the I2C bus notifier can match child clients
during registration. On failure the channel is freed but the slot was
left pointing at freed memory, which can lead to use-after-free in
i2c_atr_del_adapter() / cleanup and also block reuse with -EEXIST.

Clear the slot on the i2c_add_adapter() error path before freeing chan.

Fixes: a076a860ac ("media: i2c: add I2C Address Translator (ATR) support")
Signed-off-by: Linkai Gong <gonglinkai@kylinos.cn>
Cc: <stable@vger.kernel.org> # v6.6+
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://patch.msgid.link/20260907071102.1080840-1-gonglinkai@kylinos.cn

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Linkai Gong 2026-09-07 15:11:02 +08:00 • committed by Andi Shyti

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commit ad34235808

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drivers/i2c/i2c-atr.c

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