[PATCH 4.19 43/81] Staging: fbtft: fix memory leak in fbtft_framebuffer_alloc

[Greg Kroah-Hartman]

From: Navid Emamdoost <navid.emamdo...@gmail.com>

commit 5bdea6060618cfcf1459dca137e89aee038ac8b9 upstream.

In fbtft_framebuffer_alloc the error handling path should take care of
releasing frame buffer after it is allocated via framebuffer_alloc, too.
Therefore, in two failure cases the goto destination is changed to
address this issue.

Fixes: c296d5f9957c ("staging: fbtft: core support")
Signed-off-by: Navid Emamdoost <navid.emamdo...@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpen...@gmail.com>
Cc: stable <sta...@vger.kernel.org>
Link: https://lore.kernel.org/r/20190930030949.28615-1-navid.emamdo...@gmail.com
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/staging/fbtft/fbtft-core.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/staging/fbtft/fbtft-core.c
+++ b/drivers/staging/fbtft/fbtft-core.c
@@ -819,7 +819,7 @@ struct fb_info *fbtft_framebuffer_alloc(
        if (par->gamma.curves && gamma) {
                if (fbtft_gamma_parse_str(par, par->gamma.curves, gamma,
                                          strlen(gamma)))
-                       goto alloc_fail;
+                       goto release_framebuf;
        }
 
        /* Transmit buffer */
@@ -836,7 +836,7 @@ struct fb_info *fbtft_framebuffer_alloc(
        if (txbuflen > 0) {
                txbuf = devm_kzalloc(par->info->device, txbuflen, GFP_KERNEL);
                if (!txbuf)
-                       goto alloc_fail;
+                       goto release_framebuf;
                par->txbuf.buf = txbuf;
                par->txbuf.len = txbuflen;
        }
@@ -872,6 +872,9 @@ struct fb_info *fbtft_framebuffer_alloc(
 
        return info;
 
+release_framebuf:
+       framebuffer_release(info);
+
 alloc_fail:
        vfree(vmem);