sscanf doesn't handle %x in 2.4.20

PATCH New steven pratt 1 participant 1 message Dec 13, 2002 Kbuild

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steven pratt

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2002-12-13 16:43 UTC #0 lore raw

PATCH 1/1 sscanf doesn't handle %x in 2.4.20

In vsscanf in vsprintf.c incorectly uses isdigit to check for a leading numeric
after finding a %x and setting the base to 16. This breaks device mapper under
certain conditions. Following patch is backport from 2.5.50.

usr/src/linux-2.4.20/lib/vsprintf.c Fri Dec 13 09:57:14 2002 renamed from vsprintf.c Thu Oct 11 13:17:22 2001 +5 -1

@@ -637,7 +637,11 @@
        while (isspace(*str))
            str++;
 
-        if (!*str || !isdigit(*str))
+        if (!*str
+                    || (base == 16 && !isxdigit(*str))
+                    || (base == 10 && !isdigit(*str))
+                    || (base == 8 && (!isdigit(*str) || *str > '7'))
+                    || (base == 0 && !isdigit(*str)))
            break;
 
        switch(qualifier) {