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fs/procfs: fix potential out-of-bounds read in mount_sprintf() #20049

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Merged
acassis merged 1 commit into from
Sep 6, 2026
+5 −0
Merged

fs/procfs: fix potential out-of-bounds read in mount_sprintf() #20049

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5 changes: 5 additions & 0 deletions fs/mount/fs_procfs_mount.c
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Original file line number Diff line number Diff line change
Expand Up @@ -182,6 +182,11 @@ static void mount_sprintf(FAR struct mount_info_s *info,
linesize = vsnprintf(info->line, info->linelen, fmt, ap);
va_end(ap);

if (linesize >= info->linelen)
{
linesize = info->linelen - 1;
}

/* Copy the line buffer to the user buffer */

copysize = procfs_memcpy(info->line, linesize,
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