From: Takashi Iwai tiwai@suse.de
mainline inclusion from mainline-v5.7-rc1 commit a900cc5cd846edc6964736834e098e88d7ecfcd6 category: bugfix bugzilla: 32178 CVE: NA
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Since snprintf() returns the would-be-output size instead of the actual output size, the succeeding calls may go beyond the given buffer limit. Fix it by replacing with scnprintf().
Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Feng Yubo fengyubo3@huawei.com Reviewed-by: Tao Hou houtao1@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com Signed-off-by: Cheng Jian cj.chengjian@huawei.com --- drivers/ata/libata-transport.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c index a0b0b4d986f2..c3f446fc24c4 100644 --- a/drivers/ata/libata-transport.c +++ b/drivers/ata/libata-transport.c @@ -208,7 +208,7 @@ show_ata_port_##name(struct device *dev, \ { \ struct ata_port *ap = transport_class_to_port(dev); \ \ - return snprintf(buf, 20, format_string, cast ap->field); \ + return scnprintf(buf, 20, format_string, cast ap->field); \ }
#define ata_port_simple_attr(field, name, format_string, type) \ @@ -479,7 +479,7 @@ show_ata_dev_##field(struct device *dev, \ { \ struct ata_device *ata_dev = transport_class_to_dev(dev); \ \ - return snprintf(buf, 20, format_string, cast ata_dev->field); \ + return scnprintf(buf, 20, format_string, cast ata_dev->field); \ }
#define ata_dev_simple_attr(field, format_string, type) \ @@ -533,7 +533,7 @@ show_ata_dev_id(struct device *dev, if (ata_dev->class == ATA_DEV_PMP) return 0; for(i=0;i<ATA_ID_WORDS;i++) { - written += snprintf(buf+written, 20, "%04x%c", + written += scnprintf(buf+written, 20, "%04x%c", ata_dev->id[i], ((i+1) & 7) ? ' ' : '\n'); } @@ -552,7 +552,7 @@ show_ata_dev_gscr(struct device *dev, if (ata_dev->class != ATA_DEV_PMP) return 0; for(i=0;i<SATA_PMP_GSCR_DWORDS;i++) { - written += snprintf(buf+written, 20, "%08x%c", + written += scnprintf(buf+written, 20, "%08x%c", ata_dev->gscr[i], ((i+1) & 3) ? ' ' : '\n'); } @@ -581,7 +581,7 @@ show_ata_dev_trim(struct device *dev, else mode = "unqueued";
- return snprintf(buf, 20, "%s\n", mode); + return scnprintf(buf, 20, "%s\n", mode); }
static DEVICE_ATTR(trim, S_IRUGO, show_ata_dev_trim, NULL);