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[fix][dfs] elmfat磁盘操作设备指针判空 #11614

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[fix][dfs] elmfat磁盘操作设备指针判空 #11614

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6 changes: 6 additions & 0 deletions components/dfs/dfs_v1/filesystems/elmfat/dfs_elm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -908,6 +908,9 @@ DRESULT disk_read(BYTE drv, BYTE *buff, DWORD sector, UINT count)
rt_size_t result;
rt_device_t device = disk[drv];

if (device == RT_NULL)
return RES_ERROR;

result = rt_device_read(device, sector, buff, count);
if (result == count)
{
Expand All @@ -923,6 +926,9 @@ DRESULT disk_write(BYTE drv, const BYTE *buff, DWORD sector, UINT count)
rt_size_t result;
rt_device_t device = disk[drv];

if (device == RT_NULL)
return RES_ERROR;

result = rt_device_write(device, sector, buff, count);
if (result == count)
{
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6 changes: 6 additions & 0 deletions components/dfs/dfs_v2/filesystems/elmfat/dfs_elm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1146,6 +1146,9 @@ DRESULT disk_read(BYTE drv, BYTE *buff, DWORD sector, UINT count)
rt_size_t result;
rt_device_t device = disk[drv];

if (device == RT_NULL)
return RES_ERROR;

result = rt_device_read(device, sector, buff, count);
if (result == count)
{
Expand All @@ -1161,6 +1164,9 @@ DRESULT disk_write(BYTE drv, const BYTE *buff, DWORD sector, UINT count)
rt_size_t result;
rt_device_t device = disk[drv];

if (device == RT_NULL)
return RES_ERROR;

result = rt_device_write(device, sector, buff, count);
if (result == count)
{
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