From: Junhao Xie Date: Fri, 17 Oct 2025 08:39:06 +0000 (+0800) Subject: misc: fastrpc: Fix dma_buf object leak in fastrpc_map_lookup X-Git-Tag: v6.6.115~17 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9a297a68c3ba4a7ecb31ed52f61bd6634abb79d3;p=thirdparty%2Fkernel%2Fstable.git misc: fastrpc: Fix dma_buf object leak in fastrpc_map_lookup commit fff111bf45cbeeb659324316d68554e35d350092 upstream. In fastrpc_map_lookup, dma_buf_get is called to obtain a reference to the dma_buf for comparison purposes. However, this reference is never released when the function returns, leading to a dma_buf memory leak. Fix this by adding dma_buf_put before returning from the function, ensuring that the temporarily acquired reference is properly released regardless of whether a matching map is found. Fixes: 9031626ade38 ("misc: fastrpc: Fix fastrpc_map_lookup operation") Cc: stable@kernel.org Signed-off-by: Junhao Xie Tested-by: Xilin Wu Link: https://lore.kernel.org/stable/48B368FB4C7007A7%2B20251017083906.3259343-1-bigfoot%40radxa.com Link: https://patch.msgid.link/48B368FB4C7007A7+20251017083906.3259343-1-bigfoot@radxa.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index a85442d74e09..c110fb606dfb 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -383,6 +383,8 @@ static int fastrpc_map_lookup(struct fastrpc_user *fl, int fd, } spin_unlock(&fl->lock); + dma_buf_put(buf); + return ret; }