Alex Henrie : dbghelp: Fix memory leak on error path in dwarf2_read_range (cppcheck).

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 950792ae2b60d82ed101baa00b7bcc0dd9ba4ad8
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=950792ae2b60d82ed101baa00b7bcc0dd9ba4ad8

Author: Alex Henrie <alexhenrie24 at gmail.com>
Date:   Wed Feb  2 00:23:13 2022 -0700

dbghelp: Fix memory leak on error path in dwarf2_read_range (cppcheck).

Signed-off-by: Alex Henrie <alexhenrie24 at gmail.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/dbghelp/dwarf.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/dlls/dbghelp/dwarf.c b/dlls/dbghelp/dwarf.c
index 7472b6070e6..fc88b741a56 100644
--- a/dlls/dbghelp/dwarf.c
+++ b/dlls/dbghelp/dwarf.c
@@ -1289,6 +1289,7 @@ static struct addr_range* dwarf2_get_ranges(const dwarf2_debug_info_t* di, unsig
 {
     struct attribute            range;
     struct addr_range*          ranges;
+    struct addr_range*          new_ranges;
 
     if (dwarf2_find_attribute(di, DW_AT_ranges, &range))
     {
@@ -1312,8 +1313,13 @@ static struct addr_range* dwarf2_get_ranges(const dwarf2_debug_info_t* di, unsig
             if (*num_ranges >= alloc)
             {
                 alloc *= 2;
-                ranges = realloc(ranges, sizeof(struct addr_range) * alloc);
-                if (!ranges) return NULL;
+                new_ranges = realloc(ranges, sizeof(struct addr_range) * alloc);
+                if (!new_ranges)
+                {
+                    free(ranges);
+                    return NULL;
+                }
+                ranges = new_ranges;
             }
             ranges[*num_ranges].low = di->unit_ctx->compiland->address + low;
             ranges[*num_ranges].high = di->unit_ctx->compiland->address + high;