From: Haruto Otake <trapezoid.g@gmail.com>
Date: Sun, 15 Jul 2012 09:38:30 +0000 (+0900)
Subject: BITCOUNT: fix segmentation fault.
X-Git-Url: https://git.saurik.com/redis.git/commitdiff_plain/749aac72ad980bf08b04655634590b80e2fd014c?ds=sidebyside;hp=24bc807b5c781ba0f8d0582d47bde237d6748a5d

BITCOUNT: fix segmentation fault.

remove unsafe and unnecessary cast.
until now, this cast may lead segmentation fault when end > UINT_MAX

setbit foo 0 1
bitcount  0 4294967295
=> ok
bitcount  0 4294967296
=> cause segmentation fault.

Note by @antirez: the commit was modified a bit to also change the
string length type to long, since it's guaranteed to be at max 512 MB in
size, so we can work with the same type across all the code path.

A regression test was also added.
---

diff --git a/src/bitops.c b/src/bitops.c
index deec0971..39d24ab7 100644
--- a/src/bitops.c
+++ b/src/bitops.c
@@ -327,10 +327,9 @@ void bitopCommand(redisClient *c) {
 /* BITCOUNT key [start end] */
 void bitcountCommand(redisClient *c) {
     robj *o;
-    long start, end;
+    long start, end, strlen;
     unsigned char *p;
     char llbuf[32];
-    size_t strlen;
 
     /* Lookup, check for type, and return 0 for non existing keys. */
     if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL ||
@@ -357,7 +356,7 @@ void bitcountCommand(redisClient *c) {
         if (end < 0) end = strlen+end;
         if (start < 0) start = 0;
         if (end < 0) end = 0;
-        if ((unsigned)end >= strlen) end = strlen-1;
+        if (end >= strlen) end = strlen-1;
     } else if (c->argc == 2) {
         /* The whole string. */
         start = 0;
diff --git a/tests/unit/bitops.tcl b/tests/unit/bitops.tcl
index 0e3403bf..5945d32d 100644
--- a/tests/unit/bitops.tcl
+++ b/tests/unit/bitops.tcl
@@ -73,6 +73,12 @@ start_server {tags {"bitops"}} {
         set e
     } {ERR*syntax*}
 
+    test {BITCOUNT regression test for github issue #582} {
+        r del str
+        r setbit foo 0 1
+        r bitcount foo 0 4294967296
+    } {1}
+
     test {BITOP NOT (empty string)} {
         r set s ""
         r bitop not dest s