[PATCH 4.9 84/92] Staging: fbtft: fix memory leak in fbtft_framebuffer_alloc

[Greg Kroah-Hartman]

From: Navid Emamdoost <navid.emamdoost@xxxxxxxxx>

[ Upstream commit 5bdea6060618cfcf1459dca137e89aee038ac8b9 ]

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.emamdoost@xxxxxxxxx>
Reviewed-by: Dan Carpenter <dan.carpenter@xxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20190930030949.28615-1-navid.emamdoost@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/staging/fbtft/fbtft-core.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c
index f4682ba44cd74..d9ba8c0f1353b 100644
--- a/drivers/staging/fbtft/fbtft-core.c
+++ b/drivers/staging/fbtft/fbtft-core.c
@@ -814,7 +814,7 @@ struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 	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 */
@@ -839,7 +839,7 @@ struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 			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;
 	}
@@ -875,6 +875,9 @@ struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 
 	return info;
 
+release_framebuf:
+	framebuffer_release(info);
+
 alloc_fail:
 	vfree(vmem);
 
-- 
2.20.1