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edd: Use scnprintf() for avoiding potential buffer overflow 

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().

Link: https://lore.kernel.org/r/20200320084429.1803-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2020-03-20 09:44:29 +01:00
parent ca707b3f00
commit dbdd24eaac
1 changed files with 3 additions and 3 deletions
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6
drivers/firmware/edd.c
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@ -341,7 +341,7 @@ edd_show_legacy_max_cylinder(struct edd_device *edev, char *buf)
if (!info || !buf)
return -EINVAL;
p += snprintf(p, left, "%u\n", info->legacy_max_cylinder);
p += scnprintf(p, left, "%u\n", info->legacy_max_cylinder);
return (p - buf);
}
@ -356,7 +356,7 @@ edd_show_legacy_max_head(struct edd_device *edev, char *buf)
if (!info || !buf)
return -EINVAL;
p += snprintf(p, left, "%u\n", info->legacy_max_head);
p += scnprintf(p, left, "%u\n", info->legacy_max_head);
return (p - buf);
}
@ -371,7 +371,7 @@ edd_show_legacy_sectors_per_track(struct edd_device *edev, char *buf)
if (!info || !buf)
return -EINVAL;
p += snprintf(p, left, "%u\n", info->legacy_sectors_per_track);
p += scnprintf(p, left, "%u\n", info->legacy_sectors_per_track);
return (p - buf);
}