6.6-stable review patch. If anyone has any objections, please let me know.
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From: Dumitru Ceclan mitrutzceclan@gmail.com
commit 2f6b92d0f69f04d9e2ea0db1228ab7f82f3173af upstream.
The ad7124_find_similar_live_cfg() computes the compare size by substracting the address of the cfg struct from the address of the live field. Because the live field is the first field in the struct, the result is 0.
Also, the memcmp() call is made from the start of the cfg struct, which includes the live and cfg_slot fields, which are not relevant for the comparison.
Fix by grouping the relevant fields with struct_group() and use the size of the group to compute the compare size; make the memcmp() call from the address of the group.
Fixes: 7b8d045e497a ("iio: adc: ad7124: allow more than 8 channels") Signed-off-by: Dumitru Ceclan dumitru.ceclan@analog.com Reviewed-by: Nuno Sa nuno.sa@analog.com Link: https://patch.msgid.link/20240731-ad7124-fix-v1-2-46a76aa4b9be@analog.com Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iio/adc/ad7124.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-)
--- a/drivers/iio/adc/ad7124.c +++ b/drivers/iio/adc/ad7124.c @@ -146,15 +146,18 @@ struct ad7124_chip_info { struct ad7124_channel_config { bool live; unsigned int cfg_slot; - enum ad7124_ref_sel refsel; - bool bipolar; - bool buf_positive; - bool buf_negative; - unsigned int vref_mv; - unsigned int pga_bits; - unsigned int odr; - unsigned int odr_sel_bits; - unsigned int filter_type; + /* Following fields are used to compare equality. */ + struct_group(config_props, + enum ad7124_ref_sel refsel; + bool bipolar; + bool buf_positive; + bool buf_negative; + unsigned int vref_mv; + unsigned int pga_bits; + unsigned int odr; + unsigned int odr_sel_bits; + unsigned int filter_type; + ); };
struct ad7124_channel { @@ -333,11 +336,12 @@ static struct ad7124_channel_config *ad7 ptrdiff_t cmp_size; int i;
- cmp_size = (u8 *)&cfg->live - (u8 *)cfg; + cmp_size = sizeof_field(struct ad7124_channel_config, config_props); for (i = 0; i < st->num_channels; i++) { cfg_aux = &st->channels[i].cfg;
- if (cfg_aux->live && !memcmp(cfg, cfg_aux, cmp_size)) + if (cfg_aux->live && + !memcmp(&cfg->config_props, &cfg_aux->config_props, cmp_size)) return cfg_aux; }