fs/bcachefs/compress.c:34 __bounce_alloc() warn: possible memory leak of 'b'

[kernel test robot <lkp@intel.com>]

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Kent Overstreet <kmo@daterainc.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8f6f76a6a29f36d2f3e4510d0bde5046672f6924
commit: 1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a bcachefs: Initial commit
date:   12 days ago
:::::: branch date: 14 hours ago
:::::: commit date: 12 days ago
config: x86_64-randconfig-161-20231102 (https://download.01.org/0day-ci/archive/20231104/202311040441.HuERUoCH-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce: (https://download.01.org/0day-ci/archive/20231104/202311040441.HuERUoCH-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202311040441.HuERUoCH-lkp@intel.com/

smatch warnings:
fs/bcachefs/compress.c:34 __bounce_alloc() warn: possible memory leak of 'b'

vim +/b +34 fs/bcachefs/compress.c

1c6fdbd8f2465d Kent Overstreet 2017-03-16  25  
1c6fdbd8f2465d Kent Overstreet 2017-03-16  26  static struct bbuf __bounce_alloc(struct bch_fs *c, unsigned size, int rw)
1c6fdbd8f2465d Kent Overstreet 2017-03-16  27  {
1c6fdbd8f2465d Kent Overstreet 2017-03-16  28  	void *b;
1c6fdbd8f2465d Kent Overstreet 2017-03-16  29  
1c6fdbd8f2465d Kent Overstreet 2017-03-16  30  	BUG_ON(size > c->sb.encoded_extent_max << 9);
1c6fdbd8f2465d Kent Overstreet 2017-03-16  31  
1c6fdbd8f2465d Kent Overstreet 2017-03-16  32  	b = kmalloc(size, GFP_NOIO|__GFP_NOWARN);
1c6fdbd8f2465d Kent Overstreet 2017-03-16  33  	if (b)
1c6fdbd8f2465d Kent Overstreet 2017-03-16 @34  		return (struct bbuf) { .b = b, .type = BB_KMALLOC, .rw = rw };
1c6fdbd8f2465d Kent Overstreet 2017-03-16  35  
1c6fdbd8f2465d Kent Overstreet 2017-03-16  36  	b = mempool_alloc(&c->compression_bounce[rw], GFP_NOWAIT);
1c6fdbd8f2465d Kent Overstreet 2017-03-16  37  	b = b ? page_address(b) : NULL;
1c6fdbd8f2465d Kent Overstreet 2017-03-16  38  	if (b)
1c6fdbd8f2465d Kent Overstreet 2017-03-16  39  		return (struct bbuf) { .b = b, .type = BB_MEMPOOL, .rw = rw };
1c6fdbd8f2465d Kent Overstreet 2017-03-16  40  
1c6fdbd8f2465d Kent Overstreet 2017-03-16  41  	b = vmalloc(size);
1c6fdbd8f2465d Kent Overstreet 2017-03-16  42  	if (b)
1c6fdbd8f2465d Kent Overstreet 2017-03-16  43  		return (struct bbuf) { .b = b, .type = BB_VMALLOC, .rw = rw };
1c6fdbd8f2465d Kent Overstreet 2017-03-16  44  
1c6fdbd8f2465d Kent Overstreet 2017-03-16  45  	b = mempool_alloc(&c->compression_bounce[rw], GFP_NOIO);
1c6fdbd8f2465d Kent Overstreet 2017-03-16  46  	b = b ? page_address(b) : NULL;
1c6fdbd8f2465d Kent Overstreet 2017-03-16  47  	if (b)
1c6fdbd8f2465d Kent Overstreet 2017-03-16  48  		return (struct bbuf) { .b = b, .type = BB_MEMPOOL, .rw = rw };
1c6fdbd8f2465d Kent Overstreet 2017-03-16  49  
1c6fdbd8f2465d Kent Overstreet 2017-03-16  50  	BUG();
1c6fdbd8f2465d Kent Overstreet 2017-03-16  51  }
1c6fdbd8f2465d Kent Overstreet 2017-03-16  52  

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