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net: lan743x: Fix memleak issue when GSO enabled

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[ Upstream commit 2d52e2e38b85c8b7bc00dca55c2499f46f8c8198 ]

Always map the `skb` to the LS descriptor. Previously skb was
mapped to EXT descriptor when the number of fragments is zero with
GSO enabled. Mapping the skb to EXT descriptor prevents it from
being freed, leading to a memory leak

Fixes: 23f0703c12 ("lan743x: Add main source files for new lan743x driver")
Signed-off-by: Thangaraj Samynathan <thangaraj.s@microchip.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20250429052527.10031-1-thangaraj.s@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thangaraj Samynathan
2025-04-29 10:55:27 +05:30
committed by Greg Kroah-Hartman
parent ec00ea5645
commit dae1ce27ce
2 changed files with 7 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/ethernet/microchip/lan743x_main.c
View File

@@ -1949,6 +1949,7 @@ static void lan743x_tx_frame_add_lso(struct lan743x_tx *tx,
if (nr_frags <= 0) {
tx->frame_data0 |= TX_DESC_DATA0_LS_;
tx->frame_data0 |= TX_DESC_DATA0_IOC_;
tx->frame_last = tx->frame_first;
}
tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
tx_descriptor->data0 = cpu_to_le32(tx->frame_data0);
@@ -2018,6 +2019,7 @@ static int lan743x_tx_frame_add_fragment(struct lan743x_tx *tx,
tx->frame_first = 0;
tx->frame_data0 = 0;
tx->frame_tail = 0;
tx->frame_last = 0;
return -ENOMEM;
}
@@ -2058,16 +2060,18 @@ static void lan743x_tx_frame_end(struct lan743x_tx *tx,
TX_DESC_DATA0_DTYPE_DATA_) {
tx->frame_data0 |= TX_DESC_DATA0_LS_;
tx->frame_data0 |= TX_DESC_DATA0_IOC_;
tx->frame_last = tx->frame_tail;
}
tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
buffer_info = &tx->buffer_info[tx->frame_tail];
tx_descriptor = &tx->ring_cpu_ptr[tx->frame_last];
buffer_info = &tx->buffer_info[tx->frame_last];
buffer_info->skb = skb;
if (time_stamp)
buffer_info->flags |= TX_BUFFER_INFO_FLAG_TIMESTAMP_REQUESTED;
if (ignore_sync)
buffer_info->flags |= TX_BUFFER_INFO_FLAG_IGNORE_SYNC;
tx_descriptor = &tx->ring_cpu_ptr[tx->frame_tail];
tx_descriptor->data0 = cpu_to_le32(tx->frame_data0);
tx->frame_tail = lan743x_tx_next_index(tx, tx->frame_tail);
tx->last_tail = tx->frame_tail;

1
drivers/net/ethernet/microchip/lan743x_main.h
View File

@@ -974,6 +974,7 @@ struct lan743x_tx {
u32 frame_first;
u32 frame_data0;
u32 frame_tail;
u32 frame_last;
struct lan743x_tx_buffer_info *buffer_info;