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parport: Proper fix for array out-of-bounds access

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BugLink: https://bugs.launchpad.net/bugs/2097393

commit 02ac3a9ef3a18b58d8f3ea2b6e46de657bf6c4f9 upstream.

The recent fix for array out-of-bounds accesses replaced sprintf()
calls blindly with snprintf().  However, since snprintf() returns the
would-be-printed size, not the actually output size, the length
calculation can still go over the given limit.

Use scnprintf() instead of snprintf(), which returns the actually
output letters, for addressing the potential out-of-bounds access
properly.

Fixes: ab11dac93d2d ("dev/parport: fix the array out-of-bounds risk")
Cc: stable@vger.kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20240920103318.19271-1-tiwai@suse.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
This commit is contained in:
Takashi Iwai
2024-09-20 12:32:19 +02:00
committed by Mehmet Basaran
parent 6164a27e7a
commit 8b06f9020d
1 changed files with 11 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/parport/procfs.c
+11 -11
View File
@@ -51,12 +51,12 @@ static int do_active_device(struct ctl_table *table, int write,
for (dev = port->devices; dev ; dev = dev->next) {
if(dev == port->cad) {
len += snprintf(buffer, sizeof(buffer), "%s\n", dev->name);
len += scnprintf(buffer, sizeof(buffer), "%s\n", dev->name);
}
}
if(!len) {
len += snprintf(buffer, sizeof(buffer), "%s\n", "none");
len += scnprintf(buffer, sizeof(buffer), "%s\n", "none");
}
if (len > *lenp)
@@ -87,19 +87,19 @@ static int do_autoprobe(struct ctl_table *table, int write,
}
if ((str = info->class_name) != NULL)
len += snprintf (buffer + len, sizeof(buffer) - len, "CLASS:%s;\n", str);
len += scnprintf (buffer + len, sizeof(buffer) - len, "CLASS:%s;\n", str);
if ((str = info->model) != NULL)
len += snprintf (buffer + len, sizeof(buffer) - len, "MODEL:%s;\n", str);
len += scnprintf (buffer + len, sizeof(buffer) - len, "MODEL:%s;\n", str);
if ((str = info->mfr) != NULL)
len += snprintf (buffer + len, sizeof(buffer) - len, "MANUFACTURER:%s;\n", str);
len += scnprintf (buffer + len, sizeof(buffer) - len, "MANUFACTURER:%s;\n", str);
if ((str = info->description) != NULL)
len += snprintf (buffer + len, sizeof(buffer) - len, "DESCRIPTION:%s;\n", str);
len += scnprintf (buffer + len, sizeof(buffer) - len, "DESCRIPTION:%s;\n", str);
if ((str = info->cmdset) != NULL)
len += snprintf (buffer + len, sizeof(buffer) - len, "COMMAND SET:%s;\n", str);
len += scnprintf (buffer + len, sizeof(buffer) - len, "COMMAND SET:%s;\n", str);
if (len > *lenp)
len = *lenp;
@@ -128,7 +128,7 @@ static int do_hardware_base_addr(struct ctl_table *table, int write,
if (write) /* permissions prevent this anyway */
return -EACCES;
len += snprintf (buffer, sizeof(buffer), "%lu\t%lu\n", port->base, port->base_hi);
len += scnprintf (buffer, sizeof(buffer), "%lu\t%lu\n", port->base, port->base_hi);
if (len > *lenp)
len = *lenp;
@@ -155,7 +155,7 @@ static int do_hardware_irq(struct ctl_table *table, int write,
if (write) /* permissions prevent this anyway */
return -EACCES;
len += snprintf (buffer, sizeof(buffer), "%d\n", port->irq);
len += scnprintf (buffer, sizeof(buffer), "%d\n", port->irq);
if (len > *lenp)
len = *lenp;
@@ -182,7 +182,7 @@ static int do_hardware_dma(struct ctl_table *table, int write,
if (write) /* permissions prevent this anyway */
return -EACCES;
len += snprintf (buffer, sizeof(buffer), "%d\n", port->dma);
len += scnprintf (buffer, sizeof(buffer), "%d\n", port->dma);
if (len > *lenp)
len = *lenp;
@@ -213,7 +213,7 @@ static int do_hardware_modes(struct ctl_table *table, int write,
#define printmode(x) \
do { \
if (port->modes & PARPORT_MODE_##x) \
len += snprintf(buffer + len, sizeof(buffer) - len, "%s%s", f++ ? "," : "", #x); \
len += scnprintf(buffer + len, sizeof(buffer) - len, "%s%s", f++ ? "," : "", #x); \
} while (0)
int f = 0;
printmode(PCSPP);