Re: [Qemu-devel] [PATCH v6] linux-user/syscall.c: malloc()/calloc() to g_malloc()/g_try_malloc()/g_new0()

[Riku Voipio <riku.voipio@iki.fi>]

On tiistaina 6. lokakuuta 2015 19.17.12 EEST, Harmandeep Kaur wrote:
> Convert malloc()/ calloc() calls to g_malloc()/ g_try_malloc()/ g_new0()
>
> All heap memory allocation should go through glib so that we can take
> advantage of a single memory allocator and its debugging/tracing features.

Please use git send-email next time, I needed to manually fix the patch to 
apply.

Applied to linux-user, thanks. 

> Signed-off-by: Harmandeep Kaur <write.harmandeep@gmail.com>
> ---
> v1->v2  convert the free() call in host_to_target_semarray()
> to g_free() and calls g_try_malloc(count)  instead of 
> g_try_malloc(sizeof(count))
>
> v2->v3 used g_try_new() and friends to avoid overflow issues
>
> v3->v4 use g_free for unlock_iovec() and host_to_target_semarray().
>
> v4->v5 one missing malloc() is converted and one converted is fixed.
>
> v5->v6  new improved commit description.
>
> ---
>  linux-user/syscall.c | 28 ++++++++++++++--------------
>  1 file changed, 14 insertions(+), 14 deletions(-)
>
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index 98b5766..267aaa8 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -1559,7 +1559,7 @@ set_timeout:
>                  }
>  
>                  fprog.len = tswap16(tfprog->len);
> -                filter = malloc(fprog.len * sizeof(*filter));
> +                filter = g_try_new(struct sock_filter, fprog.len);
>                  if (filter == NULL) {
>                      unlock_user_struct(tfilter, tfprog->filter, 1);
>                      unlock_user_struct(tfprog, optval_addr, 1);
> @@ -1575,7 +1575,7 @@ set_timeout:
>  
>                  ret = get_errno(setsockopt(sockfd, SOL_SOCKET,
>                                  SO_ATTACH_FILTER, &fprog, sizeof(fprog)));
> -                free(filter);
> +                g_free(filter);
>  
>                  unlock_user_struct(tfilter, tfprog->filter, 1);
>                  unlock_user_struct(tfprog, optval_addr, 1);
> @@ -1886,7 +1886,7 @@ static struct iovec *lock_iovec(int type, 
> abi_ulong target_addr,
>          return NULL;
>      }
>  
> -    vec = calloc(count, sizeof(struct iovec));
> +    vec = g_try_new0(struct iovec, count);
>      if (vec == NULL) {
>          errno = ENOMEM;
>          return NULL;
> @@ -1950,7 +1950,7 @@ static struct iovec *lock_iovec(int type, 
> abi_ulong target_addr,
>      }
>      unlock_user(target_vec, target_addr, 0);
>   fail2:
> -    free(vec);
> +    g_free(vec);
>      errno = err;
>      return NULL;
>  }
> @@ -1975,7 +1975,7 @@ static void unlock_iovec(struct iovec 
> *vec, abi_ulong target_addr,
>          unlock_user(target_vec, target_addr, 0);
>      }
>  
> -    free(vec);
> +    g_free(vec);
>  }
>  
>  static inline int target_to_host_sock_type(int *type)
> @@ -2677,14 +2677,14 @@ static inline abi_long 
> target_to_host_semarray(int semid, unsigned short **host_
>  
>      nsems = semid_ds.sem_nsems;
>  
> -    *host_array = malloc(nsems*sizeof(unsigned short));
> +    *host_array = g_try_new(unsigned short, nsems);
>      if (!*host_array) {
>          return -TARGET_ENOMEM;
>      }
>      array = lock_user(VERIFY_READ, target_addr,
>                        nsems*sizeof(unsigned short), 1);
>      if (!array) {
> -        free(*host_array);
> +        g_free(*host_array);
>          return -TARGET_EFAULT;
>      }
>  
> @@ -2721,7 +2721,7 @@ static inline abi_long 
> host_to_target_semarray(int semid, abi_ulong target_addr,
>      for(i=0; i<nsems; i++) {
>          __put_user((*host_array)[i], &array[i]);
>      }
> -    free(*host_array);
> +    g_free(*host_array);
>      unlock_user(array, target_addr, 1);
>  
>      return 0;
> @@ -2980,7 +2980,7 @@ static inline abi_long do_msgsnd(int 
> msqid, abi_long msgp,
>  
>      if (!lock_user_struct(VERIFY_READ, target_mb, msgp, 0))
>          return -TARGET_EFAULT;
> -    host_mb = malloc(msgsz+sizeof(long));
> +    host_mb = g_try_malloc(msgsz + sizeof(long));
>      if (!host_mb) {
>          unlock_user_struct(target_mb, msgp, 0);
>          return -TARGET_ENOMEM;
> @@ -2988,7 +2988,7 @@ static inline abi_long do_msgsnd(int 
> msqid, abi_long msgp,
>      host_mb->mtype = (abi_long) tswapal(target_mb->mtype);
>      memcpy(host_mb->mtext, target_mb->mtext, msgsz);
>      ret = get_errno(msgsnd(msqid, host_mb, msgsz, msgflg));
> -    free(host_mb);
> +    g_free(host_mb);
>      unlock_user_struct(target_mb, msgp, 0);
>  
>      return ret;
> @@ -3416,7 +3416,7 @@ static abi_long 
> do_ioctl_fs_ioc_fiemap(const IOCTLEntry *ie, uint8_t *buf_temp,
>          /* We can't fit all the extents into the fixed size buffer.
>           * Allocate one that is large enough and use it instead.
>           */
> -        fm = malloc(outbufsz);
> +        fm = g_try_malloc(outbufsz);
>          if (!fm) {
>              return -TARGET_ENOMEM;
>          }
> @@ -3451,7 +3451,7 @@ static abi_long 
> do_ioctl_fs_ioc_fiemap(const IOCTLEntry *ie, uint8_t *buf_temp,
>          }
>      }
>      if (free_fm) {
> -        free(fm);
> +        g_free(fm);
>      }
>      return ret;
>  }
> @@ -7723,7 +7723,7 @@ abi_long do_syscall(void *cpu_env, int 
> num, abi_long arg1,
>              struct linux_dirent *dirp;
>              abi_long count = arg3;
>  
> -        dirp = malloc(count);
> +        dirp = g_try_malloc(count);
>          if (!dirp) {
>                  ret = -TARGET_ENOMEM;
>                  goto fail;
> @@ -7760,7 +7760,7 @@ abi_long do_syscall(void *cpu_env, int 
> num, abi_long arg1,
>          ret = count1;
>                  unlock_user(target_dirp, arg2, ret);
>              }
> -        free(dirp);
> +        g_free(dirp);
>          }
>  #else
>          {