From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>,
"Claude Opus 4.6" <noreply@anthropic.com>
Subject: [PATCH 10/12] i2c: rk3x: fix NULL pointer dereference on repeated NACK
Date: Mon, 16 Feb 2026 09:42:26 +0100 [thread overview]
Message-ID: <20260216084253.3547270-10-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20260216084253.3547270-1-a.fatoum@pengutronix.de>
In the polling loop, if a NAKRCV interrupt triggers rk3x_i2c_stop()
which sets i2c->msg to NULL, a subsequent iteration with NAKRCV
still asserted will dereference the NULL msg pointer when checking
I2C_M_IGNORE_NAK. Add a NULL check so that a NULL msg falls through
to rk3x_i2c_stop(), which handles this case safely.
Reported-by: GCC 14.2 -fanalyzer
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
drivers/i2c/busses/i2c-rk3x.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c
index 1fdce1c8de84..d35f3e1c15c8 100644
--- a/drivers/i2c/busses/i2c-rk3x.c
+++ b/drivers/i2c/busses/i2c-rk3x.c
@@ -462,7 +462,8 @@ static void rk3x_i2c_irq(struct rk3x_i2c *i2c)
ipd &= ~REG_INT_NAKRCV;
- if (!(i2c->msg->flags & I2C_M_IGNORE_NAK))
+ if (!i2c->msg ||
+ !(i2c->msg->flags & I2C_M_IGNORE_NAK))
rk3x_i2c_stop(i2c, -ENXIO);
}
--
2.47.3
next prev parent reply other threads:[~2026-02-16 8:43 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-16 8:42 [PATCH 01/12] firmware: xilinx-fpga: fix double free in probe error path Ahmad Fatoum
2026-02-16 8:42 ` [PATCH 02/12] driver: fix missing va_end in dev_add_alias " Ahmad Fatoum
2026-02-16 8:42 ` [PATCH 03/12] net: eth: avoid overlapping memcpy in eth_set_ethaddr Ahmad Fatoum
2026-02-16 8:42 ` [PATCH 04/12] pmdomain: fix dereference before NULL check in genpd_get_from_provider Ahmad Fatoum
2026-02-16 8:42 ` [PATCH 05/12] bootm: android: fix PTR_ERR called after clearing error pointer Ahmad Fatoum
2026-02-16 8:42 ` [PATCH 06/12] bootm: android: fix double close of fd Ahmad Fatoum
2026-02-16 8:42 ` [PATCH 07/12] net: phy: add NULL check for phy driver in page accessors Ahmad Fatoum
2026-02-16 8:42 ` [PATCH 08/12] open: add missing mode argument to O_CREAT calls Ahmad Fatoum
2026-02-16 8:42 ` [PATCH 09/12] hush: add NULL check for gl_pathv after do_glob_in_argv Ahmad Fatoum
2026-02-16 8:42 ` Ahmad Fatoum [this message]
2026-02-16 8:42 ` [PATCH 11/12] mci: imx-esdhc: remove misleading NULL check for cmd pointer Ahmad Fatoum
2026-02-16 8:42 ` [PATCH 12/12] mci: spi: initialize r1 to fix garbage return value Ahmad Fatoum
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