[PATCH] perf annotate: Fix objdump comment parsing for Intel mov dissassembly

[Thomas Richter]

The command 'perf annotate' parses the output of objdump and also
investigates the comments produced by objdump. For example the
output of objdump produces (on x86):

23eee:  4c 8b 3d 13 01 21 00 mov 0x210113(%rip),%r15
                                # 234008 <stderr@@GLIBC_2.2.5+0x9a8>

and the function mov__parse() is called to investigate the complete
line. Mov__parse() breaks this line into several parts and finally
calls function comment__symbol() to parse the data after the comment
character '#'. Comment__symbol() expects a hexadecimal address followed
by a symbol in '<' and '>' brackets.

However the 2nd parameter given to function comment__symbol()
always points to the comment character '#'. The address parsing
always returns 0 because the character '#' is not a digit and
strtoull() fails without being noticed.

Fix this by advancing the second parameter to function comment__symbol()
by one byte before invocation and add an error check after strtoull()
has been called.

Signed-off-by: Thomas Richter <tmri...@linux.vnet.ibm.com>
Reviewed-by: Hendrik Brueckner <brueck...@linux.vnet.ibm.com>
---
 tools/perf/util/annotate.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index aa66791b1bfc..900147454fe9 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -323,6 +323,8 @@ static int comment__symbol(char *raw, char *comment, u64 
*addrp, char **namep)
                return 0;
 
        *addrp = strtoull(comment, &endptr, 16);
+       if (endptr == comment)
+               return 0;
        name = strchr(endptr, '<');
        if (name == NULL)
                return -1;
@@ -436,8 +438,8 @@ static int mov__parse(struct arch *arch, struct 
ins_operands *ops, struct map *m
                return 0;
 
        comment = ltrim(comment);
-       comment__symbol(ops->source.raw, comment, &ops->source.addr, 
&ops->source.name);
-       comment__symbol(ops->target.raw, comment, &ops->target.addr, 
&ops->target.name);
+       comment__symbol(ops->source.raw, comment + 1, &ops->source.addr, 
&ops->source.name);
+       comment__symbol(ops->target.raw, comment + 1, &ops->target.addr, 
&ops->target.name);
 
        return 0;
 
@@ -481,7 +483,7 @@ static int dec__parse(struct arch *arch __maybe_unused, 
struct ins_operands *ops
                return 0;
 
        comment = ltrim(comment);
-       comment__symbol(ops->target.raw, comment, &ops->target.addr, 
&ops->target.name);
+       comment__symbol(ops->target.raw, comment + 1, &ops->target.addr, 
&ops->target.name);
 
        return 0;
 }
-- 
2.13.4